Question

A uranium atom is 238 times as massive as a hydrogen atom. The diameter of a uranium atom is the diameter of a hydrogen atom times about:_________

A. 3.
B. 10.
C. 30.
D. 100.
E. 238.

Answer 1

A. 3

Step-by-step explanation:

Given

The atomic radius of Hydrogen rH = 53 pm

The atomic radius of Uranium rU = 156 pm

we apply

rU / rH = 156 pm / 53 pm

⇒ rU / rH = 2.943 ≈ 3

then

rU = 3*rH