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Answer:
T is Chlorine it is non metal
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Explanation:
T is the element Chlorine
Electronic configuration of Chlorine is:- 1s^2 2s^2 2p^6 3s^2 3p^5
It's group number is 17. They are also also known as Halogens.
Its period number is 3.
It has 7 valence electrons.
Valency of chlorine is 1.
Chlorine is a non metal
No. of protons = Atomic Number
Atomic Number of Chlorine is 17.
No. of neutrons = Mass Number - Atomic Number.
= 35 - 17 = 18
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