Question

An element '' X'' has mass no. 35 and the no. of neutrons, is 18. identify the group and period of "X"

Answer 1

Hi,

Here's the answer:-

No. of protons + No. of neutrons = Mass number

=> No. of protons + 18 = 35

=> No . of protons = 35-18 = 17

So, the element is Chlorine.

It is in group 17 and period 3.

HOPE IT HELPS ☺

PLEASE MARK BRAINLIEST

Answer 2

Heya!
Here's your answer!
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❇ The element that's being spoken about in the question is Chlorine having mass number 35 and atomic number = 17 . it's a halogen .

Given : mass number = 35
number of neutrons = 18

therefore ,
=> Number of protons + number of neutrons
( Total number of nucleons)
= mass number

=> number of protons + 18 = 35

=> number of protons = 17

thus ,
the period of this element = 3
Group number = 17

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Hope this helps!