Tag: neutrons

Questions Related to neutrons

Neutron's relative charge is :

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

  1. $-1$

  2. $+1$

  3. $0$

  4. $-2$

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Correct Option: C
Explanation:

Neutron is a neutral particle.

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

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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.

Which of the following statements is false?

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

  1. Proton has a positive charge

  2. Neutron has no charge

  3. Electrons are found in regions of the atom called orbitals

  4. Electrons has a greater mass than the protons

  5. Protons and neutrons form the nucleons of the atom

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Correct Option: D
Explanation:
Electron has less mass. A proton and a neutron have effectively the same mass. A proton (or a neutron) has approximately 1837 times more massive than an electron.

$ _{7}{X}^{15}$ and $ _{8}{Y}^{15}$ differ in

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

  1. Physical properties

  2. Chemical properties

  3. Number of neutrons

  4. Number of nucleons

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Correct Option: C
Explanation:

The option (C) is the correct answer.
$\displaystyle _{7}{X}^{15}$ and $\displaystyle _{8}{Y}^{15}$ differ in number of neutrons.
Number of neutrons for $\displaystyle _{7}{X}^{15} = 15-7=8$
Number of neutrons for $\displaystyle _{8}{Y}^{15}=15*8=7$
Note: Number of neutrons $\displaystyle =$ mass number $\displaystyle -$ atomic number.

Neutrons are present in all atoms except?

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

  1. He

  2. C

  3. H

  4. Ne

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Correct Option: C
Explanation:

The available hydrogen state ${ H } _{ 1 }^{ 1 }$. It is made of 1 electron, 1 proton and no neutrons. All other elements including isotopes of Hydrogen have neutrons.

Number of neutrons present in $1.7$ g of ammonia is:

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

  1. $0.8N _A$

  2. $0.7N _A$

  3. $0.652N _A$

  4. $0.52N _A$

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Correct Option: B
Explanation:
Let us consider the problem.
For, moles of $N{H _3} = \frac{{1.7}}{{17}} = 0.1$
Let the Neutrons in 1 molecules of $N{H _3} = 7 + 3 \times 0 = 7$
Hence,
Number of Neurons $= 0.1 \times {N _A} \times 7$
The correct answer is $0.7{N _A}$

Calculate number of neutrons present in $12 \times 10^{25}$ atoms of oxygen $( _8O^{17})$:
(Given : N$ _A = 6 \times 10^{23}$)

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

  1. $1800$

  2. $1600$

  3. $1800\ N _A$

  4. $3200\ N _A$

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Correct Option: C
Explanation:

Atomic number =$ P =8$ 


Atomic Mass =$ N+P=17$


                         $N=9$
 Total no. of Neutrons = $9\times 12\times 10^{25}$

                                     =$\dfrac{9\times 12\times 10^{25}\times N _{A}}{6\times 10^{23}}$ 

                                 $=1800N _{A}$

Hence, the correct option is C.

The charge to mass ratio is highest for:

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

  1. proton

  2. electron

  3. neutron

  4. alpha

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Correct Option: B
Explanation:

The charge to mass ratio is highest for electron.
Charge/mass for :
$neutron=0/1=0, : \ $

$alpha=2/4=0.5, :$ 
$p=1/1= 1 \text { and,  }$
$ e=\dfrac {1}{1/1837}=1837$

Identify the sub-atomic particle with no charge and unit mass.

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

  1. Proton

  2. Electron

  3. Neutron

  4. All

Show answer
Correct Option: C
Explanation:

Proton have a positive charge and mass equal to one.
neutron have a zero charge and mass equal to one.
Electron have a negative charge and mass equal to 1/1840.