Question

Complete the following gaps in the given table:
Elements Protons Electrons Neutrons Atomic Number Mass Number
A 10 8
B 15 31
C 1 3
D 11 12

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Answer

We know that the number of protons = Atomic number

Number of protons = Number of electrons

Mass number = Number of protons + number of neutrons

Using these relationships, we can fill up these gaps as follows.

Elements Protons Electrons Neutrons Atomic Number Mass Number
A 8 8 10 8 18
B 15 15 16 15 31
C 1 1 2 1 3
D 11 11 12 11 23

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