Question

electronic configuration of some elements are given below
a) 1s2
b) 1s2 2s2 2p6
in which group and period of periodic table they are placed ?​

Answer 1

Answer:

Both of them are in group 18 or zero group and

Period is

a)1

b)2

Explanation:

1s2 is the electronic configuration of helium and 1s2 2s2 2p6 is the electronic configuration of neon

Answer 2

Answer:

a.Group -18

period=1

b.Grouop-18

Period-2

Explanation:

a.$1s^2$

Atomic number =2

Because there are two electron and number of protons is also .The number of protons is equal to atomic number.

Given electronic configuration is the configuration of helium because atomic number of helium is 2.

The group in which helium is placed is 18 and period is 2.

b.$1s^22s^23p^6$

Number of electrons=10

Number of protons=Number of electrons=10

Number of protons=Atomic number =10

The given configuration is the configuration of neon.

The neon is placed in group 18 and period 2.