Electrons, protons and neutrons are the fundamental particles of an atom. Identify the correct option regarding an atom.

The number of protons is always equal to the number of electrons.

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The number of protons is always equal to the number of neutrons.

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The number of protons is greater than the number of electrons.

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The number of electrons is greater than the number of protons.

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Solution

The correct option is A The number of protons is always equal to the number of electrons.
Atomic number refers to the number of protons. As atoms are always neutral, the number of electrons (negatively charged species) are equal to the number of protons (positively charged species). The number of protons are not necessarily be equal to the number of neutrons.

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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

Statement 1: Number of neutrons is always greater than or equal to the number of protons in any given atom except hydrogen.
Statement 2: Number of electrons is always equal to the number of protons in a neutral atom.

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

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. Number of neutrons is always greater than or equal to the number of protons.

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