Atomic structure
ATOMIC STRUCTURE · IMAT Doutor1 / 1
An element occurs as two isotopes of mass number 10 and 11, each with 50% abundance. Its relative atomic mass is:
A
10.0
B
10.2
C
10.5
D
11.0
E
21.0
Keyboard: A–E to choose, Shift + letter to cross out, Enter to confirm.