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Standard XII
Chemistry
Atomic Number and Mass Number
Question

The atomic weight of an atom is because of
  1. electrons and protons
  2. neutrons and protons
  3. electrons and neutrons
  4. electrons, neutrons and protons

A
neutrons and protons
B
electrons, neutrons and protons
C
electrons and protons
D
electrons and neutrons
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Solution
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Atomic weight depends upon mass number, which is equal to sum of, number of protons and neutrons.

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Similar Questions
Q1
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

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Q2
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


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Q3
The atomic weight of an element is 23 and its atomic number is 11. The number of protons,electrons and neutrons respectively present in the atom of the element are:
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Q4

Which of the following statement is correct about the atom of an element ?

(a) an atom can have only protons and neutrons but no electrons.

(b) an atom can have only electrons and neutrons but no protons

(c) an atom can have only electron and proton but no neutron

(d) an atom must always have a proton, neutron and electron

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Q5
An atom of an element has 11 protons, 11 electrons, and 12 neutrons. The atomic mass of the atom is:
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