Question

Identify the most stable atom from the following. Also give the reason

for your answer:

11Na23; 17Cl35; 13Al

27; 18Ar40​

Answer 1

Answer:

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DAV

Answer 2

Answer: 18Ar40 is the most stable atom.

Explanation:

The stability of an atom depends on the balance between the attractive nuclear force and the repulsive electromagnetic force between the protons in the nucleus. The more balanced the forces, the more stable the atom. The most stable atom has a high binding energy and a low potential energy.

Among the given options, 18Ar40 is the most stable atom. Argon has 18 protons, which means it has a stable electron configuration with a completely filled valence shell. The mass number of argon is 40, which indicates that it has 22 neutrons, giving it a neutron-to-proton ratio of 22:18 or 1.22:1. This ratio is close to the ideal ratio of 1:1, which is more stable.

On the other hand, 11Na23 has a neutron-to-proton ratio of 1.09:1, 13Al27 has a ratio of 1.08:1, and 17Cl35 has a ratio of 1.06:1, all of which are less stable than the ratio of 18Ar40. This makes 18Ar40 the most stable atom among the given options.

Therefore, the balanced forces and the ideal neutron-to-proton ratio of 18Ar40 make it the most stable atom from the given options.

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