Question

the electronic configuration of an element is 2 8 4 state its

grp no and period no

name and write its one physical property

Answer 1

group 4

period 3

its silicon

it forms covalent bond also shows catenation

Answer 2

The element with electronic configuration 2,8,4 has atomic number 14.

So the element is Silicon, symbol Si

One physical property of Silicon is as follows:

It is a hard and brittle metal.

It belongs to the group 14 and period 3 of the periodic table.  

The period number of an element is given by the number of shells it possesses.

Since, it possesses 3 shells, its period number is 3