Question

19. The atomic number of calcium is 20.
(a) State its valency.
(b) is it more or less reactive than Mg (atomic number 12) ?
(c) Will it be larger or smaller than K (atomic number 19)
(d) Write its electronic configuration.
(e) to which group and period it belongs?​

Answer 1

Answer:

As it contains only 2 valence electrons this means that it belongs to group 2 of the periodic table. Therefore, it is a group 2 element which are also known as alkaline earth metals. Hence, calcium is a metal.

Hope this will help you

Answer 2

Answer:

hope it helps

Explanation:

A)2+

B)More reactive

c)Larger

d)2.8.8.2

e)Group II and period 3