Carbon is chemical element denoted by the symbol C, have a larger atomic mass than boron, B, even though the each have six neutrons is due to the difference in the amount of protons.
<u>Explanation:</u>
Atomic mass is defined as the total mass of protons, electrons and neutrons, where due to less weightage electrons are neglected in calculation. Boron has 5 number of protons where carbon has 6 number of protons. As carbon has one more proton than boron, its value of atomic mass varies with boron.