Nucleus of an atom — task. Chemistry CBSE Live product, Class 9 (2025-26).

1. Which of the following statements is true ?

Protons have the same mass as an electron.
A proton is 1837 times heavier than an electron.
A proton is 1/1837 times lighter than an electron.
A proton is 1/1837 times heavier than an electron.

2. Which of the following is true for a neutral atom?

Atomic number = number of protons + number of neutrons
Atomic number = number of protons + number of electrons
Atomic number = number of protons = number of electrons
Atomic number = number of protons = number of neutrons

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