Why does carbon, c, have a larger atomic mass than boron, b, even though the
each have six neutrons?

Because carbon has one more proton than boron. Carbon has six and Boron has five.

Explanation:

Because it has more subatomic particles. It has one more proton, one more neutron (usually), and one more electron than boron.

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.

Explanation:

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.

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