High-school/pre-med-beginner practice on periodic trends with conceptual traps: atomic/ionic radius, effective nuclear charge, shielding, first ionization energy (including common exceptions), electron affinity, electronegativity, and metallic character. Emphasis on reasoning, not memorization.
Across a period from left to right (main-group elements), atomic radius generally decreases primarily because:
Source: entermedschool.org
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src="https://entermedschool.org/embed/questions#{"title":"Periodic Trends: Radius, Ionization Energy, Electronegativity & More","questions":[{"prompt":"Across a period from left to right (main-group elements), atomic radius generally decreases primarily because:","options":[{"label":"A","body":"Electrons are added to new shells, pushing the outer electrons farther out","isCorrect":false},{"label":"B","body":"The number of protons increases while electrons are added to the same shell, increasing effective nuclear charge","isCorrect":true},{"label":"C","body":"The number of neutrons decreases, shrinking the nucleus","isCorrect":false},{"label":"D","body":"Atoms lose electron shells as you move right","isCorrect":false},{"label":"E","body":"Electrons become heavier across a period","isCorrect":false}],"explanation":"Moving left→right, proton number rises but added electrons go into the same principal shell, so shielding doesn’t increase much. Higher effective nuclear charge pulls electrons closer, shrinking atomic radius."},{"prompt":"Down a group, atomic radius generally increases mainly because:","options":[{"label":"A","body":"Effective nuclear charge increases strongly down the group","isCorrect":false},{"label":"B","body":"Electron shells are added, and shielding increases","isCorrect":true},{"label":"C","body":"Atoms lose protons down the group","isCorrect":false},{"label":"D","body":"Valence electron number increases down the group","isCorrect":false},{"label":"E","body":"Atoms become less stable and fall apart","isCorrect":false}],"explanation":"Each step down adds a new principal energy level (shell). Increased distance and shielding outweigh the increased nuclear charge, so radius increases."},{"prompt":"Which element has the largest atomic radius?","options":[{"label":"A","body":"Li","isCorrect":false},{"label":"B","body":"Na","isCorrect":false},{"label":"C","body":"K","isCorrect":true},{"label":"D","body":"Mg","isCorrect":false},{"label":"E","body":"Cl","isCorrect":false}],"explanation":"Atomic radius increases down a group and decreases across a period. K is below Na and Li in Group 1, so it has the largest radius among the choices."},{"prompt":"Which has the smallest atomic radius?","options":[{"label":"A","body":"Na","isCorrect":false},{"label":"B","body":"Mg","isCorrect":false},{"label":"C","body":"Al","isCorrect":false},{"label":"D","body":"Si","isCorrect":false},{"label":"E","body":"Cl","isCorrect":true}],"explanation":"Across Period 3, atomic radius generally decreases left→right as effective nuclear charge increases. Chlorine is farthest right among these, so it’s smallest."},{"prompt":"Which statement best defines effective nuclear charge (Z_eff) as experienced by a valence electron?","options":[{"label":"A","body":"The total number of neutrons in the nucleus","isCorrect":false},{"label":"B","body":"The actual charge of the nucleus (atomic number) with no corrections","isCorrect":false},{"label":"C","body":"The net positive pull from the nucleus after accounting for shielding by inner electrons","isCorrect":true},{"label":"D","body":"The attraction between two atoms in a covalent bond","isCorrect":false},{"label":"E","body":"The number of electrons in the outer shell","isCorrect":false}],"explanation":"Valence electrons feel less than the full nuclear charge because inner electrons repel (shield) them. Z_eff summarizes this net attraction."},{"prompt":"Across a period, first ionization energy generally increases because:","options":[{"label":"A","body":"Atomic radius increases, so electrons are harder to remove","isCorrect":false},{"label":"B","body":"Effective nuclear charge increases, so electrons are held more tightly","isCorrect":true},{"label":"C","body":"Shielding increases dramatically, making electrons harder to remove","isCorrect":false},{"label":"D","body":"Valence electrons move into a completely new shell each step","isCorrect":false},{"label":"E","body":"Protons disappear as you move right","isCorrect":false}],"explanation":"Higher Z_eff across a period pulls valence electrons closer and holds them more strongly, so more energy is needed to remove one (higher first ionization energy)."},{"prompt":"Down a group, first ionization energy generally decreases because:","options":[{"label":"A","body":"The nucleus becomes less positive down the group","isCorrect":false},{"label":"B","body":"Electrons are added to higher shells farther from the nucleus and more shielded","isCorrect":true},{"label":"C","body":"Atoms become smaller down the group","isCorrect":false},{"label":"D","body":"Valence electron number decreases down the group","isCorrect":false},{"label":"E","body":"The octet rule stops applying","isCorrect":false}],"explanation":"Outer electrons are farther from the nucleus and shielded by more inner electrons, reducing the net pull and making electron removal easier (lower ionization energy)."},{"prompt":"Which element is expected to have the highest first ionization energy?","options":[{"label":"A","body":"Na","isCorrect":false},{"label":"B","body":"Mg","isCorrect":false},{"label":"C","body":"Al","isCorrect":false},{"label":"D","body":"Cl","isCorrect":false},{"label":"E","body":"Ne","isCorrect":true}],"explanation":"Ionization energy generally increases toward the top-right. Noble gases have very high ionization energies due to filled shells; Ne is highest among these choices."},{"prompt":"A student expects ionization energy to increase smoothly across Period 3 from Na to Ar. But there are small “drops” (exceptions). Which pair best represents a well-known drop in first ionization energy?","options":[{"label":"A","body":"Na → Mg","isCorrect":false},{"label":"B","body":"Mg → Al","isCorrect":true},{"label":"C","body":"Al → Si","isCorrect":false},{"label":"D","body":"Si → P","isCorrect":false},{"label":"E","body":"Cl → Ar","isCorrect":false}],"explanation":"From Mg to Al, the first electron removed from Al is in a higher-energy p orbital (3p) compared with Mg (3s), so it’s slightly easier to remove, causing a dip."},{"prompt":"Another classic dip in first ionization energy in Period 3 occurs between:","options":[{"label":"A","body":"Na → Mg","isCorrect":false},{"label":"B","body":"Mg → Al","isCorrect":false},{"label":"C","body":"P → S","isCorrect":true},{"label":"D","body":"S → Cl","isCorrect":false},{"label":"E","body":"Cl → Ar","isCorrect":false}],"explanation":"From P to S, an electron pairing occurs in a p orbital in sulfur, increasing electron–electron repulsion slightly and making it easier to remove one electron than expected—producing a small dip."},{"prompt":"Which statement best describes electronegativity?","options":[{"label":"A","body":"The tendency of an atom to lose electrons to form a cation","isCorrect":false},{"label":"B","body":"The tendency of an atom to attract bonding (shared) electrons","isCorrect":true},{"label":"C","body":"The energy needed to remove an electron from a gaseous atom","isCorrect":false},{"label":"D","body":"The number of protons in an atom","isCorrect":false},{"label":"E","body":"The mass number of an atom","isCorrect":false}],"explanation":"Electronegativity measures how strongly an atom attracts shared electrons in a chemical bond. It’s different from ionization energy (removing electrons)."},{"prompt":"Electronegativity generally:","options":[{"label":"A","body":"Decreases left to right and increases down a group","isCorrect":false},{"label":"B","body":"Increases left to right and decreases down a group","isCorrect":true},{"label":"C","body":"Increases left to right and increases down a group","isCorrect":false},{"label":"D","body":"Decreases left to right and decreases down a group","isCorrect":false},{"label":"E","body":"Has no relationship to periodic position","isCorrect":false}],"explanation":"Moving right, Z_eff increases and atoms attract bonding electrons more strongly. Moving down, atoms are larger and bonding electrons are farther from the nucleus, lowering electronegativity."},{"prompt":"Which element is the most electronegative?","options":[{"label":"A","body":"O","isCorrect":false},{"label":"B","body":"F","isCorrect":true},{"label":"C","body":"Cl","isCorrect":false},{"label":"D","body":"Na","isCorrect":false},{"label":"E","body":"Ne","isCorrect":false}],"explanation":"Fluorine is the most electronegative element: it is small and has a high effective nuclear charge on its valence shell, strongly attracting shared electrons."},{"prompt":"Which bond is expected to be the most polar (largest electronegativity difference)?","options":[{"label":"A","body":"H–H","isCorrect":false},{"label":"B","body":"C–H","isCorrect":false},{"label":"C","body":"H–F","isCorrect":true},{"label":"D","body":"Cl–Cl","isCorrect":false},{"label":"E","body":"N–N","isCorrect":false}],"explanation":"H–F has a large electronegativity difference (F is very electronegative). Bonds between identical atoms (H–H, Cl–Cl, N–N) are nonpolar."},{"prompt":"Which element most readily forms a 1+ ion (loses one electron easily)?","options":[{"label":"A","body":"Na","isCorrect":true},{"label":"B","body":"Mg","isCorrect":false},{"label":"C","body":"Al","isCorrect":false},{"label":"D","body":"Cl","isCorrect":false},{"label":"E","body":"Ar","isCorrect":false}],"explanation":"Alkali metals (Group 1) have one valence electron and low ionization energy, so they most readily lose it to form 1+ ions."},{"prompt":"Which element most readily forms a 1− ion (gains one electron easily)?","options":[{"label":"A","body":"Na","isCorrect":false},{"label":"B","body":"Mg","isCorrect":false},{"label":"C","body":"Cl","isCorrect":true},{"label":"D","body":"Ar","isCorrect":false},{"label":"E","body":"Al","isCorrect":false}],"explanation":"Halogens (Group 17) have 7 valence electrons and strongly tend to gain 1 electron to complete an octet, forming 1− ions like Cl−."},{"prompt":"Which species is larger in radius?","options":[{"label":"A","body":"Na","isCorrect":true},{"label":"B","body":"Na+","isCorrect":false},{"label":"C","body":"They are equal because they have the same nucleus","isCorrect":false},{"label":"D","body":"Cannot be compared","isCorrect":false},{"label":"E","body":"Na+ is larger because it is charged","isCorrect":false}],"explanation":"Cations are smaller than their neutral atoms because they have fewer electrons (often losing an outer shell) and the remaining electrons are pulled closer by the same number of protons."},{"prompt":"Which species is larger in radius?","options":[{"label":"A","body":"Cl","isCorrect":false},{"label":"B","body":"Cl−","isCorrect":true},{"label":"C","body":"They are equal because they have the same nucleus","isCorrect":false},{"label":"D","body":"Cl is larger because atoms are always larger than ions","isCorrect":false},{"label":"E","body":"Cl− is smaller because negative charge pulls electrons inward","isCorrect":false}],"explanation":"Anions are larger than their neutral atoms because adding electrons increases repulsion among electrons and reduces the effective pull per electron, expanding the electron cloud."},{"prompt":"O2−, F−, Ne, Na+, and Mg2+ are isoelectronic (10 electrons). Which is the smallest?","options":[{"label":"A","body":"O2−","isCorrect":false},{"label":"B","body":"F−","isCorrect":false},{"label":"C","body":"Ne","isCorrect":false},{"label":"D","body":"Na+","isCorrect":false},{"label":"E","body":"Mg2+","isCorrect":true}],"explanation":"In an isoelectronic series, more protons means stronger attraction on the same electron cloud, so radius decreases as nuclear charge increases. Mg2+ has the most protons."},{"prompt":"Which has the highest electronegativity?","options":[{"label":"A","body":"Li","isCorrect":false},{"label":"B","body":"C","isCorrect":false},{"label":"C","body":"O","isCorrect":false},{"label":"D","body":"F","isCorrect":true},{"label":"E","body":"Na","isCorrect":false}],"explanation":"Fluorine is the most electronegative element, reflecting its strong attraction for shared electrons due to its small size and high effective nuclear charge."}]}"
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