How you can use an atomss mass number and atomic number to determine the number of protons electrons and neutrons in the atom?

Answer 1

number of protons and electrons present in an element is equal to the atomic number of that element while number of neutrons is equal to mass number - atomic number/number of protons/number of electrons.

Answer 2

Well to find the protons and electrons mostly when using the atomic number is usually pretty well easy. The atomic number is exactly the same as how many protons an element has, or electrons. Using the Atomic Mass, to find protons, electrons, and neutrons is that it usually equals the number of protons plus neutrons.

Answer 3

If I remember from Chemistry correctly, the atomic number is the amount of protons and electrons in an element. You can use the acronym APE.

A--Atomic number/weight

P--number of Protons

E--number of Electrons

The mass number is the number of protons and neutrons combined.

For example, if you have an element with an atomic weight of 11, you know it has 11 protons and electrons. And if you know its mass number is 30, then you find the number of neutrons by doing 30-11=19.

I hope that helps.

Answer 4

The numbers of protons and of electrons in an atom are both the same as the atomic number, and the difference between the mass number and the atomic number is the number of neutrons in the atom.

Answer 5

Atomic number = number of protons.

Atomic number = number of electrons (provided the atom is electrically neutral).

Here's the trick for number of neutrons: take the mass number, round it to the nearest whole number, then subtract the atomic number from it.

Example of all 3:

Sodium (Na) has an atomic number of 11, so that's 11 protons and 11 electrons. Mass number is 22.9, which rounds to 23. 23-11=12, so 12 neutrons.

Answer 6

Atomic number is the number of protons in an atom. In a neutral atom the numbers of protons and electrons are equal. So if you know the atomic number of a neutral atom, you will also know the numbers of protons and electrons.

Mass number is the sum of protons and neutrons in a particular isotope of an atom. Since atomic number is the number of protons in an atom, subtract the atomic number (or number of protons) from the mass number to get the number of neutrons. Mass no. - atomic no. = no. of neutrons or mass no. - no. of protons = no. of neutrons.

Answer 7

The atomic number gives the number of protons in an atom, which also equals the number of electrons in a neutral atom. By subtracting the atomic number from the mass number, you can find the number of neutrons in the atom.

Answer 8

If you take the atomic mass and round it to the nearest whole number. Then you take that number and subtrat the atomic number from it in order to determine the number of neutrons.