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Standard XII
Chemistry
Atomic Number and Mass Number
Question

For an atom of a given element, the number of electrons is given by _________.
  1. the number of protons + number of neutrons
  2. the number of proton − number of neutrons
  3. the atomic number of the element
  4. the mass number of the element

A
the number of protons + number of neutrons
B
the mass number of the element
C
the atomic number of the element
D
the number of proton − number of neutrons
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Solution
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Atomic number is the number of protons or electrons found in the nucleus of the atom of an element and also the positive charge in the atomic nucleus.

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Similar Questions
Q1
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
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Q2

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


View Solution
Q3
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)
View Solution
Q4
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)
View Solution
Q5

If an atom of an element contains 17 electrons and 18 neutrons, find the number of protons, atomic number and mass number of the element.

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