Use the periodic table to determine about how many helium atoms (He) on the average would be needed to get close to the same mass as an oxygen atom (O).
A)6
B)4
C)12
D)1/4

Question

Quizplus · Accepted Answer

The atomic mass of helium is approximately 4, while the atomic mass of oxygen is approximately 16. Therefore, it would take approximately 4 helium atoms (4 x 4 = 16) to get close to the same mass as one oxygen atom. Thus, the best choice is B with an explanation as to why the atomic mass ratio between oxygen and helium is 1:4.

Use the Periodic Table to Determine About How Many Helium