Which of the following represents a pair of isotopes?
2 answers:
Answer: Option (F) is the correct answer.
Explanation:
Species which contain same number of protons but different number of neutrons are known as isotope.
For example, and
are isotopes.
These are isotopes of hydrogen and hence, each of them contain 1 proton but the number of neutrons are different.
Whereas the rest of the given species are not isotopes as they contain different number of protons.
When two species contain same atomic mass then they are known as isobars.
For example, and
are isobars.
When two different species contain same number of electrons then they are known as isoelectronic species.
For example, both and
contain 10 electrons each. Hence, they are isoelectronic.
Thus, we can conclude that and
represents a pair of isotopes.
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Explanation :
Isotope : It is defined as the element that have the same number of protons but have the different number of neutrons of each of the atom.
Atomic number is defined as the number of protons or number of electrons.
Atomic number = number of protons = number of electrons
Mass number is defined as the sum of number of protons and number of neutrons.
Number of neutrons = Mass number - Number of protons
For the given options:
(a)
Atomic number = 5
Number of proton = 5
Number of electron = 5
Atomic mass = 10
Number of neutrons = Atomic number - Number of protons
Number of neutrons = 10 - 5 = 5
(b)
Atomic number = 80
Number of proton = 80
Number of electron = 80
Atomic mass = 199
Number of neutrons = Atomic number - Number of protons
Number of neutrons = 199 - 80 = 119
(c)
Atomic number = 29
Number of proton = 29
Number of electron = 29
Atomic mass = 63
Number of neutrons = Atomic number - Number of protons
Number of neutrons = 63 - 29 = 34
(d)
Atomic number = 6
Number of proton = 6
Number of electron = 6
Atomic mass = 13
Number of neutrons = Atomic number - Number of protons
Number of neutrons = 13 - 6 = 7
(e)
Atomic number = 34
Number of proton = 34
Number of electron = 34
Atomic mass = 77
Number of neutrons = Atomic number - Number of protons
Number of neutrons = 77 - 34 = 43