SSC (English Medium) Class 8Maharashtra State Board
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# Answer the Following - SSC (English Medium) Class 8 - Science

#### Question

Answer the following :

what is meant by subatomic particle ? give brief information of three subatomic particles with refrence to electrical charge, mass and location.

#### Solution

Subatomic particles : A subatomic particle is a structural and functional unit of the matter. That means all the matters are made up of these fundamental particles. According to modern atomic theory, an atom has a nucleus, which is present in its center or core. These nucleus contain subatomic particles like protons and neutrons.
Difference between subatomic particles are as follows :

Electron
1. Electrons are present outside the nucleus of an atom.
2. Electrons are negatively charged that is
(1.6 × 10-19 coulomb).
3. The mass of an electron is considered to negligible. It is 1800  times less than that of a hydrogen
4.Relative mass = 1/ 1840 times hydrogen
5. It revolves around the nucleus in the discrete orbit.

Proton
1. Protons are present in the nucleus of an atom.
2. Protons are positively charged that is (1.6 × 10-19  coulomb).
3. The mass of a proton is approximately 1u(1Dalton) that is (1u = 1.66 × 10-27 g).
4. They are closely bound in the nucleus.

Neutron
1. Neutrons are present in the nucleus of an atom.
2. Neutrons are neutral.There is no charge.
3. The mass of a neutron is nearly equal to the mass of a proton that is 1u(1Dalton) that is (1u = 1.66 × 10-27 g).
4. They are closely bound in the nucleus.

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#### APPEARS IN

Solution Answer the Following Concept: Atomic Structure.
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