Certain element X’exist as two isotopes of Atomic mass 20.5 and 21.5

1.	Certain element X’exist as two isotopes of Atomic mass 20.5 and 21.5 u as 50% abundance each.The atomic mass of X’ should be(a) 20.5 u(b) 21.50(c)42u(d)2lu
Answer» ANSWER: the answer is OPTION D OK

Certain element X’exist as two isotopes of Atomic mass 20.5 and 21.5 u as 50% abundance each.The atomic mass of X’ should be(a) 20.5 u(b) 21.50(c)42u(d)2lu

Answer»

the answer is OPTION D OK