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Byju's Answer
Standard XII
Chemistry
Atomic Number and Mass Number
What does the...
Question

What does the mass number of an atom represent?

A
Only the number of protons
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B
The number of protons and neutrons
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C
The number of protons and electrons
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D
Only the number of neutrons
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Solution

The correct option is A The number of protons and neutrons
The mass number tells us the number the sum of nucleons i.e number of protons and neutrons in the nucleus of an atom. The atomic number is the number of protons found in the nucleus of an atom. It is traditionally represented by the symbol Z

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Q. Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons
Q. Identify the correct statements.
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons
Q. Question 6
Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic number = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons

(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)
Q. Question 6
Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic number = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons

(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)
Q. Complete the following table.​

(i)

Atomic number​

Mass number​

Number of neutrons​

Number of protons​

Number of electrons​

Name of the Atomic species​

9​

-​

10​

-​

-​

-​

(ii)

Atomic number​

Mass number​

Number of neutrons​

Number of protons​

Number of electrons​

Name of the Atomic species​

16​

32​

-​

-​

-​

Sulphur​

(iii)

Atomic number​

Mass number​

Number of neutrons​

Number of protons​

Number of electrons​

Name of the Atomic species​

16​

32​

-​

-​

-​

Sulphur​

(iv)

Atomic number​

Mass number​

Number of neutrons​

Number of protons​

Number of electrons​

Name of the Atomic species​

-​

2​

-​

1​

-​

-​

(v)

Atomic number​

Mass number​

Number of neutrons​

Number of protons​

Number of electrons​

Name of the Atomic species​

-​

1​

0​

1​

1​

-​

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