A | B | |
Protons | 17 | 17 |
Neutrons | 18 | 20 |
Answer:
(a) Mass number of A =No. of protons + No. of neutrons
= 17 + 18 = 35 u
Mass number of 5 = 17 + 20 = 37 u
(b) They are isotopes of same element. Isotopes are the atoms of same
element having the same atomic number but different mass numbers.
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