2 Answers

Which of the following groups of physical properties increase from…

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CHEMISTRY

Which of the following groups of physical properties increase from left to right of the Periodic Table?

1. Ionization energy

2. Atomic radius

3. Electronegativity

4. Electron affinity

A. 1 and 2

B. 1, 2 and 3

C. 3 and 4

D. 1, 3 and 4

QUICK ANSWER…

D

DETAILS…  

Ionization energy is the energy required to remove an electron from the outer-most shell of an atom, it increases across the period, and decreases down the group.

Atomic radius is the average distance between the nucleus and the outer-most shell of an atom. It decreases across the period and increases down the group.

Electronegativity is the tendency of an atom to accept an electron to form a bond, it increases from left to right as we move across the period.

Electron affinity is the energy released when an electron is added to an atom. It increases from left to right as we move across the period, and sometimes decreases down the group.

Now for the right answer to the above question:

  1. Option A is incorrect. atomic radius decreases across the period.
  2. Option B is incorrect. atomic radius decreases across the period.
  3. C is incorrect. 3 and 4 are correct, but 1 too is correct.
  4. D is the correct answer.

KEY-POINTS…

You may please note these/this:

  • Atomic radius decreases across the period because of the effective increase in nuclear charge.

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/ culled from 2015 JAMB-UTME Chemistry past question 9 /

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