Chapter 4

NCERT
Class 9
Science
Solutions
1. For the Symbol H, D and T tabulate three sub-atomic particles found in each of them.

Question:

For the Symbol H, D and T tabulate three sub-atomic particles found in each of them.

Answer:

H, D and T are the isotopes of Hydrogen, the following is the table of their subatomic particles :

Isotope Symbol Mass
Number
Number of
electrons
Number
of
Protons
Number of
Neutrons
Hydrogen H 1 1 1 0
Deuterium D 2 1 1 1
Tritium T 3 1 1 2

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