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Consider the following statements (X andY stand for two different elements):
(I) 3265X and 3365Y are isotopes.
(II) 4286X and 4285Y are isotopes.
(III) 85174X and 88177Y have the same number of neutrons.
(IV) 92235 X and 94235Yare isobars.
Which of the above statements are correct?
(a) Only statements II and IV are correct
(b) Only statements I, II and IV are correct
(c) Only statements II, III and IV are correct
(d) All statements are correct
Consider the following statements (X andY stand for two different elements):
(I) 3265X and 3365Y are isotopes.
(II) 4286X and 4285Y are isotopes.
(III) 85174X and 88177Y have the same number of neutrons.
(IV) 92235 X and 94235Yare isobars.
Which of the above statements are correct?
(a) Only statements II and IV are correct
(b) Only statements I, II and IV are correct
(c) Only statements II, III and IV are correct
(d) All statements are correct
Answer is : (c) Only statements II, III and IV are correct
For a nucleus, ZAX
Mass number, A = N + Z
where, N = number of neutrons and Z = number of protons.
In 3265X and 3365Y, number of protons are different. So, these are not isotopes.
In 4286X and 4285Y, number of protons are equal. So, these are isotopes.
In 85174X and 88177Y, number of neutrons are 174 – 85 = 89 and 177 – 88 = 89.
So, both have same number of neutrons.
In 92235 X and 94235Y, both have same mass number, so these are isobars.