Question

(a) Helium atom has an atomic mass of u. It has two protons in its nucleus. How many neutrons does it have?

(b) What are the limitations of Rutherford's model of an atom.


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Answer 1

a) 2

b)It could not explain the stability of an atom, i.e how a positive charge in the atom holds the negatively charged electrons. It could not explain the position of nucleus in an atom. Drawbacks of Rutherford's Model: The orbital revolution of the electron is not expected to be stable

Answer 2

☆$\red {HELLO\:DEAR}$☆

Helium atom has two neutrons.

The mass of an atom is the sum of the masses of protons and neutrons present in its nucleus.

Since helium atom has two protons, mass contributed by the two protons is (2 × 1) u = 2 u.

Then, the remaining mass (4 − 2) u = 2 u is contributed by 2u/1u = 2 neutrons.

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