Question

1) An element has its electronic configuration as 2, 8, 8, 2. Answer the
following questions:
i) What is the atomic number of this element ?
ii) What is the group of this element ?
iii) To which period does this element belong?​

Answer 1

Answer:

(I) atomic number of this element = 20

(ii) Group of this elemen is two

(iii) This element belong to 4th period.

Explanation:

Total number of electron = 20

In neutral atom total number of electrons is equal to total number of protons

so, total number of protons = 20

(I) Atomic number = total number of protons = 20

(ii) Group of this elemen is two

(iii) the period of an element is determined with the help electronic configuration in which how many sells electrons are present. This element belong to 4th period.

The element is Calcium (Ca).