Taking into account the definition of atomic mass and atomic number, the atomic number of boron is 5.
Atomic mass
All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them.
On the other hand, the atomic mass tells us the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus:
Atomic mass = (number of protons) + (number of neutrons)
Atomic number
The atomic number is the total number of protons that make up the atomic nucleus of a given chemical element.
Atomic number of boron
In this case you know that a boron atom has:
- an atomic mass of 11.
- 6 neutrons.
Then, replacing in the definition of atomic mass:
11 = number of protons + 6
11 - 6= number of protons
5= number of protons
Since the atomic number is the total number of protons, the atomic number of boron is 5.
Learn more about atomic mass and atomic number:
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