Dealing with Potassium - Finding Protons, Neutrons and Electrons?

Question

A neutral atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons and electrons.

Answer 1

K(potassium) ;

Protons # = 19
Neutrons # = 20
Electrons # = 19

number of protons is indicated by the element's atomic number

number of neutrons is indicated by atomic mass number minus atomic number

number of neutrons = number of protons
in a neutral atom.


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Answer 2

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Dealing with Potassium - Finding Protons, Neutrons and Electrons?
A neutral atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons and electrons.

Answer 3

Number of element = number of protons and electrons in ground state. Take away one proton, you have a different element. Take away one electron, same element, just becomes an ion.
Number of neutrons = atomic mass minus atomic number

So, putting this all together, we get:
Protons = 19
Electrons = 19
Neutrons = 20

Answer 4

At. No. = 19 = 19 protons

19 protons = 19 electrons

At. Mass No - At. No. = 39 - 19 = 20 neutrons

Answer 5

dealing potassium finding protons neutrons electrons

Answer 6

If the atom is neutral, than the it will have the same number of electrons as protons, which is 19. The atomic number is the number of protons.

Now for the number of neutrons. THe mass number is the sum of the number of protons and neutrons. So subtract 19 from 39 and you have 20, the number of neutrons.

Answer 7

Electrons equal the protons.
Protons equal the atomic number
Neutrons are the atomic mass - the protons
SO...

E: 19
P:19
N:20

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