NEET Chemistry Ionization Energy MCQ Question
Which combination of statements about ionization energy is correct?
Ionization energy decreases down a group. 2. Ionization energy increases across a period. 3. Shielding effect decreases ionization energy.
Ionization energy is always positive. 2. Ionization energy increases down a group. 3. It is easier to remove an electron from smaller atoms.
Ionization energy varies significantly among isoelectronic species. 2. Inner core electrons increase effective nuclear charge. 3. Ionization energy is influenced by atomic radius.
Ionization energy is defined for isolated gaseous atoms. 2. Addition of an electron generally requires energy. 3. Elements with higher atomic numbers have lower ionization energy.
Correct Answer
Detailed Explanation
Statement 1 is correct as ionization energy generally decreases down a group due to increased distance from the nucleus. Statement 2 is accurate since ionization energy increases across a period due to increased effective nuclear charge. Statement 3 is also correct as the shielding effect reduces the nuclear charge felt by valence electrons, lowering ionization energy.
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