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Introduction of Atomic Structure

A particle P ...

Question

A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be :
(a) a molecule
(b) a binary compound
(c) an anion
(d) a cation

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Solution

(d) cation
Particle P must be a cation.

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Q. A particle X has 17 protons, 18 neutrons and 18 electrons. This particle is most likely to be :
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Q. An atom has 18 protons, 18 electrons, and 20 neutrons. This atom has _____.

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Q. A free neutron decays to a proton but a free proton does not decay to a neutron. This is because
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(c) neutron has large rest mass than the proton
(d) weak forces can operate in a neutron but not in a proton.

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