Tag: what is inside atom

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

Density of neutron is of the order of :

  1. $10^3 kg/cc$
  2. $10^6 kg/cc$
  3. $10^{12} kg/cc$
  4. $10^2 kg/cc$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$Atomic\quad radius\quad of\quad neutron\quad =\quad { 10 }^{ -13 }cm\ mass\quad of\quad neutron\quad =\quad 1.6749\times { 10 }^{ -27 }kg\ density\quad of\quad neutron\quad =\quad \dfrac { Mass }{ Volume } =\quad { 10 }^{ 12 }\quad kg/cc$

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

Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?

  1. 4

  2. 2

  3. 8

  4. 6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Helium has 2 neutrons. The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus. Since, the number of protons present in helium is 2 and given mass is 4. Therefore, the number of neutrons will be equal to $2$ i.e. $4-2.$

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

Carbon has six protons and six neutrons in its nucleus. What is the atomic mass of carbon?

  1. 4

  2. 12

  3. 8

  4. 6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The atomic mass of carbon is $12$. The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus. Since, the number of protons and neutrons present in carbon is $6$.
Therefore, the atomic mass of carbon is $12$ i.e. $6 + 6=12$.

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

Oxygen atom has an atomic mass of 16 u and eight neutrons in its nucleus. What is its atomic number?

  1. 4

  2. 12

  3. 8

  4. 6
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The atomic number of oxygen is 8. The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus. Also, atomic number is the number of protons present in the nucleus. Since, the number of neutrons present in oxygen is 8 and given mass is 16. Therefore, the number of neutrons will be equal to $8$ i.e. $16-8$.

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

The ratio of neutrons in ${O}^{16}$ and ${O}^{18}$ is

  1. $8 : 10$
  2. $4 : 5$
  3. $9 : 8$
  4. $1 : 1$
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

 The ratio of neutrons in $\displaystyle {O}^{16}$ and $\displaystyle {O}^{18}$ is $\displaystyle 4 : 5 \text { or } 8 : 10$
Number of neutrons in $\displaystyle {O}^{16} = 16-8=8$
Number of neutrons in $\displaystyle {O}^{18}=18-8=10$