Q14 of 31 Page 198

Identify the element that has the lower Ionization energy in each pair oldie following and mark it with a symbol (3).

(i) Mg or Na


(ii) Li or O


(iii) Br or F


(iv) K or Br

Note: Ionization goes on increasing as we move from left to right.


Ionization goes on decreasing from top to bottom.


i) Na has lower ionization energy because as we move from Na to Mg, the ionization energy increases.


ii) Li has lower ionization energy because as we move from Li to O, the ionization energy increases.


iii) F has lower ionization energy because as we move from F to Br, the ionization energy decreases.


iv) K has lower ionization energy because as we move from K to Br, the ionization energy increases.


More from this chapter

All 31 →
12

The electronic configuration of elements X, Y and Z are given below?

a) X = 2


b) Y = 2, 6


c) Z= 2, 8, 2


i) Which element belongs to second period?


ii) Which element belongs in second group?


iii) Which element belongs to 18th group?

 13

Identify the element that has the larger atomic radius in each pair of the following and mark it with a symbol (3).

(i) Mg or Ca


(ii) Li or Cs


(iii) N or P


(iv) B or Al

 15

In period 2, element X is to the right of element Y. Then, find which of the elements have:

(i) Low nuclear charge


(ii) Low atomic size


(iii) High ionization energy


(iv) High electro negativity


(v) More metallic character

 16

How does metallic character change when we move

(I) Down a group


(II) Across a period?