Question

An element x of atomic number 18 what is the position of element X in Modern Periodic Table​

Answer 1

Answer:

The electronic configuration of element is X

K L M

2 , 8 , 5

Since , there are 3 Orbits hence the period is 3.

Now, the valence electrons in the element X is = 5

Hence , the group no. is ( 10+5 ) = 15

Therefore , the element belongs to GROUP 15 and PERIOD 3 .

That is the element X is Phosphorus.

Explanation:

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Answer 2

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