If an atom has 35 electrons and its mass number is 80 calculate the number of protons?

Answer 1

In a neutral atom, the number of electrons will be the same as the number of protons. This is because one positive proton will cancel out one negative electron; therefore, if the atom is neutral, it must have the same number of protons and electrons.

The number of protons is also the same as the atomic number. For this example, Bromine, with the atomic number of 35, has 35 protons.

Bromine:

Atomic number- 35

Number of protons- 35

Number of electrons- 35

The mass number is the sum of the atomic number (or number of protons/electrons) and the neutrons. For this example, we know the atomic number (35) + # neutrons = mass number (80). To figure out the number of neutrons, take the mass number and subtract the number of electrons/protons/atomic number. Mass number (80) - atomic number (35) = neutrons (45).

Answer 2

45.

Explanation : The atomic number gives us the number of protons in the nucleus of an atom. The Atomic Mass is calculated by adding up the protons and neutrons.

Thus, the number of neutrons can be found by subtracting the Atomic Number (which is the number of protons) from the Atomic Mass ( protons + Neutrons).

thus, 80-35 = 45.

Answer 3

The mass number would be probably be 55 (unless it was an ion of an element). When dealing with atomic mass you add the number of protons to neutrons, but generally in neutral atoms protons are the same number as electrons.

Answer 4

The number of electrons is equal to the number of protons.

To figure out the number of neutrons, subtract the # of electrons from the atomic mass.

Hope this helps!

Answer 5

If it has 35 protons, 35 electrons and 45 neutrons it is bromine with a mass number of 80.

Answer 6

35.

The number of protons in an atom always equals the number of electrons.

Answer 7

the atomic number is 35. So there are 35 protons.

Answer 8

The atomic number of bromine is 35.