In general terms, which statements most correctly describes the relationship between the ionization energy, electronegativity and atomic radius of a group of elements in the same period (a row of elements).

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Consider the general trend for elements in the same period: as you move from left to right across a row, atomic radius tends to decrease because effective nuclear charge pulls electrons closer. 
Option 1: 'As atomic radius decreases, the ionization energy and electronegativity increase' aligns with these trends. A smaller radius means electrons are held more tightly by the nucleus, so removing an electron (ionization energy) requires more energy, and the atom is more eager to attract electrons (electronegativity).
Option 2: 'These concepts are not related' is misleading. Ionization energy and electronegativity are both influenced by atomic size and nuclear charge, so they are related and often covary in a period.
Option 3: 'As atomic radius increases, the ionization energy and electronegativity also increase' is incorrect for a period. Increasing radius generally reduces ionization energy and electronegativity because electrons are held less tightly.
Option 4: 'As atomic radius decreases, the ionization energy increases but electronegativity decreases' contradicts the common trend that electronegativity increases as radius decreases; both ionization energy and electronegativity typically rise with decreasing radius.
Option 5: 'As atomic radius increases, the ionization energy increases but electronegativity decreases' is inconsistent with period trends where increasing radius usually lowers both ionization energy and electronegativity rather than increasing them.
In summary, the statement in Option 1 coherently describes the established pattern for elements within the same period, reflecting how smaller atomic size corresponds to higher ionization energy and greater electronegativity.

CHM1052 - MUM S2 2025 Week 7: Preparation quiz

In general terms, which statements most correctly describes the relationship between the ionization energy, electronegativity and atomic radius of a group of elements in the same period (a row of elements).

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