Mass Number and Representation of Atom

Q.

The number of nucleons in an atom is called __________________.

1. mass number

2. atomic number

3. electronic number

4. neutron number

Q.

Name the particles which are present in the nu­cleus and what type of charge is there on them?

Q.

Which subatomic particles of an atom are responsible for mass number?

Q.

Which subatomic particles do not have any charge?

Q.

The ion of an element has $3$ positive charges. The mass number of the atom is $27$ and the number of neutrons is $14$. What is the number of electrons in the ion?

1. $13$

2. $10$

3. $14$

4. $16$

Q.

Complete the following table.

Sl. No	Name of the element	Symbol	Mass number	Atomic number	Number of protons	Number of electrons	Number of neutrons
1	Sodium	${}_{11}{}^{23}\mathrm{Na}$	___	___	11	___	___

Q.

Complete the following.

Sl. No	Name of the element	Symbol	Mass number	Atomic number	Number of protons	Number of electrons	Number of neutrons
1	____	${}_9{}^{19}\mathrm{F}$	19	___	___	____	____

Q.

Choose the correct option.

The mass number of an atom whose unipositive ion has 10 electrons and 12 neutrons is:

1. 23

2. 22

3. 20

4. 21

Q.

State whether the following statements are true or false.

The mass number of an element has specific units

1. True
2. False

Q. The atomic number of an atom is 30 and its mass number is 60. Which of the following is correct?

1. Number of electrons = 30
2. Number of protons = 39
3. Number of neutrons = 29
4. Number of neutrons = 19