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

Number of electrons = 30

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Number of neutrons = 19

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Number of neutrons = 29

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Number of protons = 39

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Solution

The correct option is A Number of electrons = 30
Given that,
Atomic number = 30 and Mass number = 60
We know that,
Atomic number = number of protons = number of electrons = 30
Also,
Number of neutrons = mass number - atomic number = 60 - 30 = 30

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Similar questions

Q. Which of the following statement is always correct?

(a) an atom has equal number of electrons and protons

(b) an atom has equal number of electrons and neutrons

(d) an atom has equal number of electrons, protons and neutrons

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. Question 17
Which of the following statement is always correct?

(a) An atom has equal number of electrons and protons
(b) An atom has equal number of electrons and neutrons
(c) An atom has equal number of protons and neutrons
(d) An atom has equal number of electrons, protons and neutrons

Which of the following statements is/ are correct about neutral elements?

(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 electrons
(iv) Mass number = number of neutrons = number of electrons

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

The correct option is A Number of electrons = 30Given that, Atomic number = 30 and Mass number = 60 We know that, Atomic number = number of protons = number of electrons = 30 Also, Number of neutrons = mass number - atomic number = 60 - 30 = 30

The correct option is A Number of electrons = 30
Given that,
Atomic number = 30 and Mass number = 60
We know that,
Atomic number = number of protons = number of electrons = 30
Also,
Number of neutrons = mass number - atomic number = 60 - 30 = 30