An atom has 7 electrons in its M - shell and contains 18 neutrons in i

1.
An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number ?

A. 25

B. 27

C. 35

D. 43

Answer» D. 43

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An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number ?

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1.	An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number ?
A.	25
B.	27
C.	35
D.	43
Answer» D. 43