Author Question: If two protons and two neutrons are removed from the nucleus of an oxygen atom, a nucleus of which ... (Read 129 times)

D2AR0N · **on:** Jul 29, 2018

If two protons and two neutrons are removed from the nucleus of an oxygen atom, a nucleus of which element remains?

A) nitrogen-12
B) carbon-12
C) neon-18
D) carbon-14

Question 2

Boron has primarily two isotopes, one with an atomic mass of 11 amu and another with an atomic mass of 10 amu. If the abundance of the boron atom with a mass

of 11 amu is 18.9 percent and the abundance of the other isotope is 81.1 percent, what would be the average mass of the boron atom?
A) 10.19 amu
B) 11 amu
C) 10 amu
D) 10.81 amu
E) not enough information given