Question

Q9. If Z=4, the name of the element will be:
O
a) Hydrogen
O b) Helium
O c) Lithium
O d) Beryllium​

Answer 1

Answer:

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Explanation:

Beryllium

By z=4,we mean that the atomic number(z) of element is 4. Its electronic configuration is 2,2. Hence, the valency of this electron is 2 since the outermost shell has only two electron. Therefore, the element with z= 4 is Beryllium(Be).

Answer 2

Answer:

your answer is

D) Beryllium

Explanation:

Here, Z means atomic number .So, the atomic number of Beryllium is 4

and so the correct answer is Beryllium

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