Write down the characteristics of the elements having atomic number 17.

Electronic configuration ………………………….

Period number ………………………….

Group number ………………………….

Element family ………………………….

No. of valence electrons ………………………….

Valency ………………………….

Metal or non-Metal ………………………….

a. The electronic configuration of the element (Z=17) is:

1s² 2s² 2p⁶ 3s² 3p⁵

b. Period number = 7

As the element has 7 electrons in the outermost shell (3s² 3p⁵). Hence, it belongs to period 7.

c. Group number = 3

In the element (1s² 2s² 2p⁶ 3s² 3p⁵), 3 is the highest principal quantum number. Hence, it belongs to third period.

d. Element family = p-block element

The element belongs to group 3 and period 7, this means it is located at the right side of the periodic table. Hence, it belongs to p-block family.

e. Valence electrons = 7

The element (1s² 2s² 2p⁶ 3s² 3p⁵) has 7 valence electrons, i.e., electrons in the outermost shell (3s² 3p⁵).

f. Valency = 1

The valency is the number of electrons needed to complete the octet. So the element (2,8,7) need only one electron to achieve noble gas configuration (2,8,8)

g. Non-metal