Question

an element X has mass no. 35 and the no. of neutrons is 18 identify the group no. and preiod of X

Answer 1

8mass no.=35
no. of neutrons=18
Atomic no. of x=mass no.-no. of neutrons
x=35-18=17
E.C.=2,8,7
group no.=17
period no.=3
valency=8-7=1
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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 ) .