Question

Which element has the second smallest atomic radius in its group and the third lowest first
lonisation energy in its period?
A.boron
B.calcium
C.magnesium
D.sodium​

Answer 1

Answer:

i think the correct answer is (c)

Answer 2

The element that has the second smallest atomic radius in its group and the third lowest first ionization energy in the period is

c) Magnesium.

Explanation:

• The atomic radius increases down a group as the number of shells gets added as one move down a group.

• Therefore inspite of the increase in nuclear charge down the group,because of the increase in number of shells,atomic radius increases.

• Ionization energy is the energy required to remove the outermost electron from a neutral gaseous atom and hence to convert it into a unipositive ion.

• As we move down a group,the first ionization energy decreases as the size of the atom increases and hence the nuclear pull decreases.

• Therefore the element with second smallest atomic radius in its group and the third lowest first ionization energy in its period is for Magnesium.