Atomic Structure

Both the isotopes of Chlorine in accordance to their relative abundance in nature are found in the form 3;1.

hence,Average atomic mass of Chlorine=

(3x35 + 1x37)/3+1 =35.5.....(a)
Also,Atomic weight=no. of protons + no. of neutrons.

no. of neutrons in Cl-35= 35 - 17
=18.
no. of neutrons in Cl-37= 37 - 17
=20. ......(b)

Gven % of Cl-35 is 75%
and that of Cl-37 is 25%
(a) Average atomic mass of chlorine is[((75*35)/100)+((25*37)/100)]
=26.25+9.25=35.50(Ans)
(b) No of neutrons:-
in Cl-35=35-17=18(Ans)
in Cl-37=37-17=20(Ans)
ANSWER:-
AVERAGE ATOMIC MASS OF CHLORINE IS 35.50g
NUMBER OF NEUTRONS IN Cl-35 IS 18
NUMBER OF NEUTRONS IN Cl-37 IS 20....