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Atomic Radii and Ionization Energy (Group 1)

The heavier n...

Question

The heavier nuclei tend to have larger N/Z ratio because

A

a neutron is heavier than a proton

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B

a neutron is an unstable particle

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C

a neutron does not exert electric repulsion

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D

Coulomb force has longer range as compared to the nuclear force

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Solution

The correct options are
A a neutron is heavier than a proton
D Coulomb force has longer range as compared to the nuclear force

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Q. The heavier nuclei tend to have larger N/Z ratio because
(a) a neutron is heavier than a proton
(b) a neutron is an unstable particle
(c) a neutron does not exert electric repulsion
(d) Coulomb forces have longer range compared to the nuclear forces.

Q. A free neutron decays to a proton but a free proton does not decay to a neutron. This is because
(a) neutron is a composite particle made of a proton and an electron whereas proton is a fundamental particle
(b) neutron is an uncharged particle whereas proton is a charged particle
(c) neutron has large rest mass than the proton
(d) weak forces can operate in a neutron but not in a proton.

Q. Inspite of mutual repulsion between the protons and no electric force between neutrons, a number of protons and neutrons do stay together to form stable nuclei. Which of the following are reasons for this?

1

. Another type of force, called nuclear force works between these particles when they are very close to each other

2

. The neutrons keep the protons apart so that there is no repulsion between them

3

. The nuclear force is always attractive and does not depend on the charge of the particles
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Q. The heavier stable nuclei tend to have larger N/Z ratio because

F_{p p}, F_{p n} a n d F_{n n}

denotes the magnitudes of the nuclear force by a proton-proton, proton-neutron and neutron-neutron respectively. When the separation is 1 fermi, then :

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