Tag: neutrons

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Questions Related to neutrons

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

The lightest particle is/are :

  1. electron

  2. proton

  3. neutron
  4. $\beta$-particle
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation
The electron is the lightest particle of the atom. It has a mass of $ 9.1 \times 10^{-28}$ grams. Comparing this mass to that of the proton's at $1.6726 \times 10^{-24}$ grams, an electron is nearly $0.0005$ times the proton's mass.

Beta particles are high-energy, high-speed electrons or positrons emitted by certain types of radioactive nuclei. Hence, their mass will similar to that of the electron.

Hence, options A and D are correct.
Multiple choice chemistry structure of the atom neutrons discovery of neutrons structure of atoms
State whether true or false :

A neutron can be found in all atoms.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The statement, 'Neutron can be found in all atoms' is false.


Neutron is absent in hydrogen atoms. 

The nucleus of $ _1^1H$ contains only a proton. 

So it is not necessary that all atoms have neutron in them.

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

Assertion : Protons are better projectiles than neutrons.
Reason : The neurons being neutral do not experience repulsion from positively charged nucleus.

  1. If both (A) and (R) are correct, and (R) is the correct explanation of (A).

  2. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).

  3. If (A) is correct, but (R) is correct.

  4. If (A) is incorrect, but (R) is correct.

  5. If both (A) and (R) are incorrect.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Neutrons are better projectiles than protons.
The decreasing order of the projectile power is $\displaystyle _0n^1 > _{1}H^{1} > _{1}H^{2}> _{2}He^{4}$
The neurons being neutral do not experience repulsion from positively charged nucleus.
Thus, (A) is incorrect, but (R) is correct.

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

Arrange the following particle in increasing order of values of e/m ratio : electron (e), proton (p), neutron (n) and $\displaystyle \alpha $-particle $\displaystyle (\alpha) $.

  1. n, p, e, $\displaystyle \alpha $
  2. n, $\displaystyle \alpha $, p, e
  3. n, p, $\displaystyle \alpha $, e
  4. e, p, n, $\displaystyle \alpha $
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$\displaystyle n< \alpha < p< e$            

e/m of n = 0
$\displaystyle e/m: : of: : \alpha =\frac{9.58\times 10^{4}}{2}c/g$
e/m of p = $\displaystyle 9.58\times 10^{4}: : c/g$
e/m of e = $\displaystyle 1.7588\times 10^{8}: : c/g$

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

Which of the following has the greatest mass?

  1. Electron

  2. Proton

  3. Neutron

  4. Hydrogen cation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Neutron has greatest mass. Proton is a subatomic particle with symbol p and positive electric charge of +1 elementary charge and mass slightly less than that of neutron. Mass of neutron is $1.6749\times10^{-27}  kg$.

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

The triad of nuclei that is isotonic is :

  1. $^{14} _6C,\,^{15} _7N,\, ^{17} _9F$
  2. $^{12} _6C,\,^{14} _7N,\, ^{19} _9F$
  3. $^{14} _6C,\,^{14} _7N,\, ^{17} _9F$
  4. $^{14} _6C,\,^{14} _7N,\, ^{19} _9F$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

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

  1. isobars

  2. isomers

  3. isotones

  4. isotopes
Reveal answer Fill a bubble to check yourself
C Correct answer
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 $isotones$.

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

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

  1. isotopes

  2. isobars

  3. isotones

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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 $C$