Subatomic particles and atomic mass — task. Science CBSE, Class 9 New.

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Identify the correct answer:

1. Why does the mass number of an atom depend mainly on protons and neutrons?

Electrons have a negative charge
Electrons do not move around the nucleus
Electrons have very little mass compared to protons and neutrons
Electrons are found outside the atom

2. Why do larger atoms generally contain more neutrons than smaller atoms?

To increase the number of electrons
To give the nucleus a negative charge
To make the atom lighter
To help hold the positively charged protons together in the nucleus

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