Question

What would be the group and period no. of elements having atomic number 3,8,18,20 ?

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Answer 1

Explanation:

3- group 1 period 2

8- group 16 period 2

18 group 18 period 3

20 group 2 period 4

Answer 2

Answer:

3 - group 1A (lithium)

8 - group 8A ( oxygen)

18- zero group ( argon)

20- 2A group ( calcium)

What do mean by period no.

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