Question

An atom has electronic configuration 2,8,7.
Point a what is the atomic number of this element ?
Point b to which of the following elements would it be chemical similar?(atomic number are given in parentheses)
N(7),F(9),P(15),and At(18)

Answer 1

Answer:

as electronic configuration of the given atom 2,8,7 it is informed that the atomic number of element is 17 (2+8+7). Thus element with atomic number 17 is chlorine.

the element would it be chemically similar is F(9)

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Answer 2

Answer:

a) - - - The atomic number of this element is 17 and its name is CHLORINE.

b) - - it will be similar to the element F(9) because they belong to same period