Question

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Potassium has atomic number 19 and mass number 39 .

Find the -:

(i) Electrons
(ii) Protons
(iii) Neutrons

(If possible give some information about electrons , protons and neutrons)

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Answer 1

Explanation:

Potassium (K) " latin name kalium "

atomic number = 19, neutron number = 20, mass number = 39.098/39

The atomic number is the number of protons in the nucleus of an atom.

mass number = number of protons + number of neutrons.

protons and neutrons are present in the centre of the atom in a place called nucleus

and electrons revolve around the nucleus

protons have a positive charge, electrons have a negative charge and neutrons have a neutral charge or no charge or charge less.

Answer 2

Given :

• Potassium has atomic number 19 and mass number 39 .

To find :

• Electrons
• Protons
• Neutrons

Solution :

Potassium with atomic number 19 and mass number 39 can be represented as :-

${ \large \bf K}^{19} _{39}$

i. Number of electrons :-

Atomic number is total number of protons present in an atom. For potassium atom , atomic number is given as 19. Therefore number of protons in potassium is 19.

For an atom number of protons is equal to number of electrons.

So, number of electrons in potassium = 19

ii. Number of protons :-

Atomic number is total number of protons present in an atom.

So, number of protons in potassium = 19

iii. Number of neutrons :-

We know that :-

Mass number = Number of protons + number of neutrons

Mass number is given as 39.

➡️ 39 = 19 + number of neutrons

➡️ 39-19 = number of neutrons

➡️ 20 = number of neutrons

So, number of neutrons in potassium = 20

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An atom is the smallest particle of an element which can take part in a chemical reaction. Atom is made up of still particle like electrons , protons and neutrons.

Electron :-

• Negatively charged , present outside the nucleus.

• Discovered by J.J Thomson

• Mass = 9.11× 10^(-28) g

• Amount of charge = -1.6 × 10^(-19)

Proton :-

• Positively charged , present inside the nucleus of an atom

• Discovered by Rutherford

• Mass = 1.672 × 10^(-24) g

• Amount of charge = +1.6 × 10^(-19)

Neuton :-

• Neutral , present inside the nucleus of an atom.

• Discovered by J. Chadwick

• Mass = 1.675 × 10^(-24) g

• Amount of charge = 0