The mass number of an atom is determined by -Adding the number of protons and number of electronsAdding the number of neutrons and number of electronsThe number of protons onlyAdding the number of neutrons and number of protons

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Standard XII

Chemistry

Abundance and Isotopes

The mass numb...

Question

The mass number of an atom is determined by __________.

Adding the number of neutrons and number of electrons

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Adding the number of protons and number of electrons

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The number of protons only

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Adding the number of neutrons and number of protons

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Solution

The correct option is D Adding the number of neutrons and number of protons
The mass number of an atom is the total number of protons and neutrons in an atomic nucleus. The mass number is written either after the element name or as a superscript to the left of an element's symbol. For e.g. for carbon 14, an isotope of carbon, it is written as carbon-12 or $^{12} C$

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Similar questions

The mass number of an atom is determined by the number of protons and neutrons. Calculate the mass number of a Sodium (Na) atom if the number of neutrons in it are 12.

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. How many electrons, protons and neutrons are there in a nucleus of atomic number

11

and mass number

24

?
(i) number of electron

=

________.
(ii) number of protons

=

________.
(iii) number of neutrons

=

_______.

Q. Atomic number (Z) of a neutral atom and mass number (A) of an atom are equal to:

(Here n = number of neutrons and p = number of protons):

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