Chapter 4

NCERT
Class 9
Science
Solutions
19. Complete the following table—

Question:

Complete the following table:

Atomic
number
Mass
number
Number
of
Neutrons
Number
of
Protons
Number
of
electrons
Name of
the atomic
species
9 10
16 32 Sulphur
24 12
2 1
1 0 1 0

Answer:

Atomic
number
Mass
number
Number
of
Neutrons
Number
of
Protons
Number
of
electrons
Name of
the atomic
species
9 19 10 9 9 Fluorence
16 32 16 16 16 Sulphur
12 24 12 12 12 Magnesium
1 2 1 1 1 Hydrogen (deuterium)
1 1 0 1 0 Hydrogen (Protium)

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