Question

The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 2nd group and the 4th period?
A) 20 B) 22 C) 18 D) 10

Answer 1

Answer:

answer is 20

........

Explanation:

2nd group contains Be,Mg,Ca,Sr,Ba,Ra fourth period is Ca so atomic no. is 20....

Answer 2

Answer:

ANSWER IS

A) 20

Explanation:

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