Question

An element "X" has mass number 35 and the number of neutrons is 18. Identify the he group number and period of "X"

Answer 1

X is Chlorine.
Group no.: 17
Period no.: 3
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Answer 2

Answer:

We know :

Atomic number = Mass number - No. of neutrons.

Atomic number = 35 - 18

= > 17

Electronic configuration :

2 , 8 , 7

Group no. = 17

Period no. = 3

Name of element is Chlorine (  Cl ) .