37 Which general trends in first ionization energy and electronegativity values are demonstrated by Group 15 elements as they are considered in order from top to bottom? (1) The first ionization energy decreases and the electronegativity decreases.

(2) The first ionization energy increases and the electronegativity increases.

(3) The first ionization energy decreases and the electronegativity increases.

(4) The first ionization energy increases and the electronegativity decreases.

Question

Chemistry

Charlee Mccall

8 October, 13:51

37 Which general trends in first ionization energy and electronegativity values are demonstrated by Group 15 elements as they are considered in order from top to bottom? (1) The first ionization energy decreases and the electronegativity decreases.

(2) The first ionization energy increases and the electronegativity increases.

(3) The first ionization energy decreases and the electronegativity increases.

(4) The first ionization energy increases and the electronegativity decreases.

+4

Answers (1)

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Bobby · Answer 1

Correct answer: The first ionization energy decreases and the electronegativity decreases.

Reason:

As we move from top to bottom in a periodic table, atomic radius increases. Also, effective nuclear charge decreases. Due to this, energy required to remove the electron form valance shell decreases. Hence, ionization energy decreases from top to bottom.

In addition to this, metallic character increases from top to bottom. Metals have low electronegativity as compared to non-metals. Hence, electronegativilty value decreases from top to bottom.