Tag: structure of atoms

Questions Related to structure of atoms

The fundamental particle which has no charge and has mass almost equal to that of positively charged fundamental particle is ..............

chemistry what is inside atom discovery of neutrons structure of atoms discovery of subatomic particles

  1. proton

  2. neutron

  3. electron

  4. $\beta$-particle

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Correct Option: B
Explanation:

The fundamental particle which has no charge and has mass almost equal to that of positively charged fundamental particle is neutron.

The charge on neutrons is :

chemistry structure of the atom discovery of neutrons structure of atoms discovery of subatomic particles

  1. $-1.602\times10^{-19}C$

  2. $1.602\times10^{-19}C$

  3. $0$

  4. None of the above

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Correct Option: C
Explanation:

Neutrons are neutral. 


They do not have any charge. 

They are electrically neutral.

Hence the correct option is C.

The mass of an atom is : 

chemistry what is inside atom discovery of neutrons structure of atoms discovery of subatomic particles

  1. the sum of the masses of protons and electrons present in the nucleus.

  2. equal to the mass of neutrons in the nucleus.

  3. the sum of the masses of protons and neutrons present in the nucleus.

  4. none of the above.

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Correct Option: C
Explanation:

The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus.

Neutron is represented as :

chemistry what is inside atom discovery of neutrons structure of atoms discovery of subatomic particles

  1. $\displaystyle { n }^{ + }$

  2. $\displaystyle { n }^{ - }$

  3. $\displaystyle { n }^{ -+ }$

  4. $\displaystyle n$

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Correct Option: D
Explanation:

Neutron is represented as "n" as it does not have any charge.

Which of the following is not a subatomic particle of an atom?

chemistry what is inside atom discovery of neutrons structure of atoms discovery of subatomic particles

  1. Electrons

  2. Protons

  3. Nucleus

  4. Neutrons

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Correct Option: C
Explanation:

The three subatomic particles of atom are: electrons, protons and neutrons.

In which year James Chadwick discovered neutrons ?

chemistry what is inside atom discovery of neutrons structure of atoms discovery of subatomic particles

  1. $1930$

  2. $1931$

  3. $1932$

  4. $1933$

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Correct Option: C
Explanation:

In the year $1932$ James Chadwick discovered neutrons. He bombarded lighter elements like boron and beryllium by alpha particles.

A neutron has :

chemistry what is inside atom discovery of neutrons structure of atoms discovery of subatomic particles

  1. positive charge

  2. negative charge

  3. no charge

  4. all of above

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Correct Option: C
Explanation:

The neutron is a subatomic particle with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons, each with mass approximately one atomic mass unit, constitute the nucleus of an atom, and they are collectively referred to as nucleons.

Who was awarded Nobel prize for discovery of neutron?

chemistry what is inside atom discovery of neutrons structure of atoms discovery of subatomic particles

  1. Chadwick

  2. Dalton

  3. Rutherford

  4. Thomson

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Correct Option: A
Explanation:

James Chadwick was assigned the task of tracking down evidence of Rutherford's tightly bound "proton-electron pair" or neutron. In 1932, Chadwick proposed that this particle was Rutherford's neutron. In 1935, he was awarded the Nobel Prize for his discovery.

Chadwick concluded that the mass of the emitted particle is similar to that of :

chemistry what is inside atom discovery of neutrons structure of atoms discovery of subatomic particles

  1. electron

  2. photon

  3. proton

  4. none of the above

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Correct Option: C
Explanation:

Chadwick concluded that the mass of the emitted particle is similar to that of proton. Mass of proton is 1.0072766 a.m.u. and that of neutron is 1.0086654 a.m.u.

When beryllium was bombarded with alpha particles, this lead to the formation of :

chemistry what is inside atom discovery of neutrons structure of atoms discovery of subatomic particles

  1. C-13 and protons

  2. C-12 and neutrons

  3. C-13 and electrons

  4. C-13 and neutrons

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Correct Option: B
Explanation:

Chadwick carried the experiments, using many different elements as radiation targets besides paraffin. What really occurred when one bombarded beryllium with alpha particles, there was the formation of a carbon-12 nucleus and the emission of a neutron.