Question

1. Name the three sub-atomic
particles of an atam.
2. Helium atom has an atomic mass
of 4 u and two protons in its
nucleus. How many neutrons
does it have?​

Answer 1

Answer:

1) protons, neutrons, and electrons.

2) 2 neutrons

Answer 2

Answer:

Ans.1 Proton → Positively charged

Electron → Negatively charged

Neutron → No charge

Ans.2 Atomic mass of he = 4u

No. of protons = 2

Atomic mass = No. of protons + No. of neutrons

:. 4 = 2 + No. of neutrons

:. No. of neutrons = 4 - 2 = 2

Explanation:

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