Question

1. If number of electrons in an atom
is 8 and number of protons is also
8, then (1) what is the atomic
number of the atom? and (ii) what
is the charge on the atom?

2. With the help of Table 4.1, find
out the mass number of oxygen
and sulphur atom.
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Answer 1

Answer:

(i) The atomic number is equal to the number of protons. Therefore, the atomic number of the atom is 8. (ii) Since the number of both electrons and protons is equal, therefore, the charge on the atom is 0.

2.For Oxygen:

Number of protons = 8

Number of electrons = 8

Mass number = Number of Protons + Number of neutrons

= 8 + 8

= 16

Hence mass number for Oxygen is 16.

For Sulphur:

Number of protons = 16

Number of electrons = 16

Mass number = Number of Protons + Number of neutrons

= 16 + 16

= 32

Hence Mass number for Sulphur is 32.

Explanation:

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Answer 2

Answer:

The atomic number is equal to the number of protons. Therefore, the atomic number of the atom is 8.

(ii) Since the number of both electrons and protons is equal, therefore, the charge on the atom is 0.