Neutron has a mass almost equal to that of;

1. electron
2. proton
3. alpha particles
4. neutrino
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Answer: B
Explanation:
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The properties of atoms mainly depend upon

1. fundamental particles
2. subatomic particles
3. nucleons
4. all of these
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Answer: A
Explanation:
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Alpha particles are;

1. He atoms
2. He⁺² ions
3. H⁺
4. high energy electrons
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Answer: B
Explanation:
• Aplha particles are dipositive helium ions.
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Alpha particle has the same no of electrons as;

1. He atom
2. Li⁺ ion
3. H⁺ ion
4. Be⁺² ion
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Answer: C
Explanation:
• Alpha particle like H⁺ ion has no electron
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Alpha particles are produced in the discharge tube when it is filled with;

1. H₂ gas
2. Neon gas
3. air
4. He gas
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Answer: D
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How many times a neutron is heavier than an electron?

1. 1836
2. 1839
3. 1/1836
4. 1742
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Answer: B
Explanation:
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The particle which has twice the charge of proton and about 4 times its mass is;

1. He atom
2. Be atom
3. alpha particle
4. beta particle
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Answer: C
Explanation:
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Alpha particle is -------- times heavier than a proton.

1. 4
2. 2
3. 3
4. 5
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Answer: A
Explanation:
• Alpha particle (He⁺² ion) has mass numberr of 4 a.m.u
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Which of the following is not a fundamental or subatomic particle of an atom;

1. neutron
2. alpha particle
3. positron
4. meson
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Answer: B
Explanation:
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Nucleus of atoms was discovered by;

1. Rutherford
2. Goldstein
3. Chadwick
4. J.J Thomson
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Answer: A
Explanation:
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