An atom has electronic configuration 2, 8, 7.
(a) What is the atomic number of this element?
(b) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.)
N(7) F(9) P(15) Ar(18)

NCERT Class X
Science - Science

Chapter_Periodic Classification of Elements

2

Answers

2015-06-03T15:23:32+05:30
A- The atomic no of this element(Chlorine) is 17.
b- F(9)
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2015-06-03T15:31:56+05:30
(a) The element with electronic configuration ( 2+8+7) 17 is chlorine.
The no. of atomic number = no. of electrons
Therefore, atomic number is 17.

(b)It is chemically similar to - F(9).
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