An element A has atomic number 20 :
a) Write the electronic configuration.
b) To which group and period does it belong?
c) What is its valency?

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Solution

Atomic number $20$ is of Calcium -
Electronic configuration – 1s2 2s2 2p6 3s2 3p6 4s2.
Group - It belongs to second group.
Period – It belongs to $4$ th period.
Valency – Valency of calcium is $+ 2$

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An element A has atomic number 20 :a) Write the electronic configuration.b) To which group and period does it belong?c) What is its valency?

Atomic number 20 is of Calcium -Electronic configuration – 1s2 2s2 2p6 3s2 3p6 4s2.Group - It belongs to second group.Period – It belongs to 4th period.Valency – Valency of calcium is +2

An element A has atomic number 20 :
a) Write the electronic configuration.
b) To which group and period does it belong?
c) What is its valency?

Atomic number $20$ is of Calcium -
Electronic configuration – 1s2 2s2 2p6 3s2 3p6 4s2.
Group - It belongs to second group.
Period – It belongs to $4$ th period.
Valency – Valency of calcium is $+ 2$