The mass numbers of three isotopes of an element are 11, 12, 13 units
CHEMISTRY · Single correct · A Level · Chemistry · Atomic structure · Atomic structure
Problem
The mass numbers of three isotopes of an element are 11, 12, 13 units. Their percentage abundance is 80, 15, and 5 respectively. What is the atomic weight of the element?
(1) 10.25
(2) 11.25
(3) 12.25
(4) 13.25