An element X has mass number 35 and number of neutrons (a) Write the atomic number of X. (b) Give electronic
configuration of X. (c) To which group and period does it belong?
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Answer:
I suppose you forgot to write the no. of neutrons but anyways the element would be chlorine.
(a)
atomic no.=mass no. - no. of neutrons
= 35 - 18
= 17
(b)
Using 2n² formula you can get to know the no. of electrons each orbit holds
electronic configuration= 2 , 8 , 7
(c)
Group - 17
Period - 3
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