How do you tell how many protons neutrons and electrons are in an atom?

Answer 1

Inspect the Periodic Table.

For every element two numbers are given.

The larger number is thre Atomic Mass. and ther smaller number is the ATOMIC NUMBER.

The ATOMIC NUMBER tells, us ;-

#1 ; the elements position in the periodic table.

#2 ; the number of protons in the nucleus of the element

#3 ; the number of electrons in the neutrally charged atom.

If you subtract the Atomic mass from the Atomic Number , the difference is the number of neutrons in the nucleus.

Taking Carbon as an example.

Symbol 'C'

Position in the periopdic Table is '6'

Number of protonsw in the nucleus is '6'

Number of electrons in the neutrally charged atoms is '6'

The atomic Mass is given as '12'

So subtracting 12 - 6 = 6 Six is the number of neutrons in carbon.

NB For every element, the Atomic Mass may vary. This is because the number of neutrons may vary. Carbon is no exception.

This variations are knowen as isotopes.

Above are the details for the commonest isotope of carbon.

However, Carbon has isotopes

C-13 , 7 neutrons (used in nmr analysis)

C-14 , 8 neutrons. (carbon dating).

Answer 2

Next to the element symbol is two numbers; the bottom one is the amount of protons, which is equal to the amount of electrons, and the top minus the bottom number is the amount of neutrons. the answer is 16

Answer 3

IF you know the atomic mass and the atomic number the atomic no. is the number protons and electrons(number of protons is the same as the number of electrons) and whatever the atomic mass - protons and you will get the number of neutrons

Answer 4

the mass number (A) minus the atomic number (Z) gives you the number of neutrons

the atomic number is situated at the top of each element the mass number is written at the base of each number

Answer 5

Protons= The Atomic number, the top one in each symbol. Eg, Carbon=6 Protons

Electrons= The Atomic Number.

Neutrons= Mass number - Atomic Number. Eg, Carbon = 12-6=6 Neutrons

Answer 6

Atomic number = number of protons = number of electrons

Mass number = Number of protons + number of neutrons