Tag: what is inside atom

Questions Related to what is inside atom

Who determined the mass of a neutron?

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

  1. John Dalton (early 1800's)

  2. Ernest Rutherford (1911)

  3. Niels Bohr (1913)

  4. James Chadwick (1932)

Show answer
Correct Option: D
Explanation:

The presence of neutron and its mass was determined by James Chadwick. Neutron was discovered by bombarding $\alpha-$particles on $Be$. On doing so, highly energetic beam of radiation was observed by Chadwick. Thus mass of neutron was determined by James Chadwick.

Whose experiment proved the existence of the nucleus?

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

  1. John Dalton (early 1800's)

  2. Ernest Rutherford (1911)

  3. Niels Bohr (1913)

  4. James Chadwick (1932)

Show answer
Correct Option: B
Explanation:

The $\alpha-$ ray scattering-gold foil experiment by Ernest Rutherford gave substantial evidence for  existence of nucleus in $1911$. Thus the existence of nucleus was proved by Rutherford's experiment.

Neutron was discovered by:

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

  1. J.J. Thomson

  2. Chadwick

  3. Rutherford

  4. Priestley

Show answer
Correct Option: B
Explanation:

 Neutron was discovered by Chadwick.
To overcome the failure of proton electron hypothesis, Rutherford, in 1920, proposed the existence of neutral particle made from close combination of proton and electron. He named it neutron.
In 1932, Lord Chadwick proved the existence of neutron by bombarding lighter elements (boron and beryllium) with alpha particles which resulted in the emission of highly penetrating neutral radiation.

The neutron is a neutral (non-electrical) particle in the centre of the atom. It was discovered when a tiny piece of the metal, beryllium, was bombarded with alpha particles. This discovery was made by:

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

  1. Chadwick

  2. Rutherford

  3. Niels Bohr

  4. Enrico Fermi

Show answer
Correct Option: A
Explanation:
In 1930, it was discovered that Beryllium, when bombarded by alpha particles, emitted a very energetic stream of neutral radiation. In 1932, Chadwick proposed that neutral radiation consists of a new type of neutral particles - neutrons.

In 1932, ___________ discovered an electrically neutral particle in the atom named as neutron.

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

  1. Rutherford

  2. James chadwick

  3. J.J. Thompson

  4. none of the above

Show answer
Correct Option: B
Explanation:

in 1932, James Chadwick discovered neutron.

According to J. Chadwick, __________ is not found in hydrogen atom.

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

  1. neutron

  2. electron

  3. proton

  4. none of the above

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Correct Option: A
Explanation:

According to Chadwick, neutron is not not found in hydrogen.

Isotone of an element has :

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

  1. Same number of electron

  2. Same number of protons

  3. Same number of neutrons

  4. Same number of neutrons & protons

Show answer
Correct Option: C
Explanation:

Isotone of an element has same no. of neutrons

The triad of nuclei that is isotonic is :

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

  1. $^{14} _6C,\,^{15} _7N,\, ^{17} _9F$

  2. $^{12} _6C,\,^{14} _7N,\, ^{19} _9F$

  3. $^{14} _6C,\,^{14} _7N,\, ^{17} _9F$

  4. $^{14} _6C,\,^{14} _7N,\, ^{19} _9F$

Show answer
Correct Option: A
Explanation:

The triad of nuclei that is isotonic is  $^{14} _6C,\,^{15} _7N,\, ^{17} _9F$.
Number of neutrons are
$C -14-6=8$
$N-15-7=8$
$F-17-9=8$

The atoms of different elements having the same number of neutrons are known as :

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

  1. isobars

  2. isomers

  3. isotones

  4. isotopes

Show answer
Correct Option: C
Explanation:

Two nuclides are isotones if they have same neutron number but different proton number e.g. $boron-12$ and $carbon-13$ both contain 7 neutrons so they are $isotones$.

The nuclides $^{40} _{18}Ar$ and $^{41} _{19}K$ are :

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

  1. isotopes

  2. isobars

  3. isotones

  4. none of these

Show answer
Correct Option: C
Explanation:

The two or more species of atoms or nuclei that have the same number of neutrons are called as isotones.


The nuclides $^{40} _{18}Ar$ and $^{41} _{19}K$ are isotones. Because they have the same number of neutron.

So, the correct option is $C$