Question

a element "X" has mass number 35 and the number of neutrons , is 18 identify the group number and the period of "X" (pls answer fast)....

Answer 1

as no.of neurons is 18 its atomic no.is 18 so its argon of viiiA group and 3rf period of pblock elements

Answer 2

mass no = no.of protons +no.of neutros
35=18+protons
protons = 17
electrons is also =17
the element is chlorine
so it can written as 2,8,7
it belongs to 3rd period and 17 th grp
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