an element "X" has mass no. 35 and the no. of neutrons is 18. identity the group no. and period of "X"
(from the periodic table)
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Chlorine (17) mass number 35.5
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no of protons is equal to (mass no) minus (no of neutrons)
35 minus 18 which is equal to 17.
no of protons is equal to no of electrons.
so no of electrons is equal to 17.
electronic configuration is 2,8,7.
no of valence electrons are 7.
so group no is (10 plus 7)which is equal to 17.
so the group no is 17.(representative elements)
period no is equal to no of shells
element x has 3 shells (k,l,m)
so the period no is 3.
group no is 17
period no is 3
hope it helps u
35 minus 18 which is equal to 17.
no of protons is equal to no of electrons.
so no of electrons is equal to 17.
electronic configuration is 2,8,7.
no of valence electrons are 7.
so group no is (10 plus 7)which is equal to 17.
so the group no is 17.(representative elements)
period no is equal to no of shells
element x has 3 shells (k,l,m)
so the period no is 3.
group no is 17
period no is 3
hope it helps u
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