Question

From the symbol Na state the :
a) mass number of sodium _________
b) Atomic number of sodium _________
c) Electronic configuration _________
d) Number of Protons _________
e) Number of Neutrons _________

TNSCERT Class 9 General Science Ch4 Atomic Structure

Answer 1

a) mass number= 23
b)Atomic number= 11
c)Electronic configuration= 2,8,1
d)Number of proton = 11
e) Number of Neutrons = 12

Answer 2

a) 23
b) 11
c) 2 8 1
d) 11
e) 12