The atomic number of astatine which belongs to the sixth period is:

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Solution

The correct option is D 85
He (2)
F Ne (10)
Cl Ar (18)
Br kr (36)
I xe (54)
As Rn (86)
Since the position of astatine is just before the Rn.
so atomic no of astatine is 85

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The atomic numbers of three elements A, B and C are given below :

Element Atomic number

A 5

B 7

C 10

(i) Which element belongs to group 18? (ii) Which element belongs to group 15?

(iii) Which element belongs to group 13? (iv) To which, period/periods do these elements belong?

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