Author Question: An element found in another galaxy exists as two isotopes. If 80.0 percent of the atoms have an ... (Read 73 times)

humphriesbr@me.com · **on:** Jul 29, 2018

An element found in another galaxy exists as two isotopes. If 80.0 percent of the atoms have an atomic mass of 80.00 atomic mass units and the other 20.0 percent have an atomic mass of 82.00 atomic mass units, what is the atomic mass of the element?

A) 81.0 atomic mass units
B) 64.0 atomic mass units
C) 80.4 atomic mass units
D) 16.4 atomic mass units
E) 81.6 atomic mass units

Question 2

Which of the following diagrams best represents the size of the atomic nucleus relative to the size of the atom?

A) A
B) B
C) C
D) D