How do you find out how many neutrons are in an atom?

Answer 1

For any element in ther Periodic Table., two numbers are given. They are the Atomic No. and the Atomic Mass.

The Atomic Number indicates the elements position in the periodic table.

The number of protons in the element

The number of electrons in the nuetrally charged element.

The Atomic mass is the total of all the protons and neutrons in the nucleus of an atom .

So to find the number of neutrons in an element , the difference between the Atomic Mass and the Atomic Number is the number of neutrons present.

Two examples ; -

hydrogen ; [1/1] H ; 1 - 1 = 0 so no neutrons.

chlorine ; [35/17]Cl ; 35-17 = 18 so 18 neutrons present.

NB The larger number is the Atomic Mass, usually printed at the top left of a given element. The small number is the Atomic Number, usually printed at the bottom(left) of any given element.

Answer 2

You have to subtract the number of protons in the element by the Mass number. You find the # of protons because it the same as the Atomic number. And find the Mass Number by rounding the Atomic Mass to the nearest Whole number.

Answer 3

you round the Atomic mass number to a whole number, and then you minus the atomic number, by the atomic mass.

Answer 4

Find the elements atomic number by locating it on the periodic table. Find the difference between atomic mass and atomic number to find the number of neutrons in an atom.

Answer 5

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