atom has a configuration 2,8,7 a) name the group and period to which belongs . b) out of there which elements are chemically similar N(7) , F(9), P(5)

atom has a configuration 2,8,7 a) name the group and period to which b

1.	atom has a configuration 2,8,7 a) name the group and period to which belongs . b) out of there which elements are chemically similar N(7) , F(9), P(5)
Answer» is chlorineit BELONGS to 17th group and 3RD periodF(9) is CHEMICALLY SIMILAR