Question

PLEASE HELP!!!

The atomic number of an atom is 10 and its mass number is 21. How many protons, neutrons, and electrons does the atom have?

Answer 1

Answer:

Electron = 10

Proton = 10

Neutrons = 11

Explanation:

if you want to calculate the number of neutrons and element simply , just subtract number of The number of electrons in a neutral atom is equal to the number of protons. or the atomic number fom the mass number n atomic number of an element is equal o the number of electrons present

Atomic no = no of proton present or

Mass number = proton + neutrons

21 = protons +11

protons = 10

The number of electrons in a neutral atom is equal to the number of protons.

Answer 2

The atom has:

1. Proton = 10

2. Neutron = 11

3. Proton = 10

1. Determination of the number of protons.

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

Atomic number = 10

Proton = Atomic number = 10

2. Determination of the neutron number.

The mass number of an element is the sum of the protons and neutrons in the nucleus of the atom of the element.

Mass number = 21

Proton = 10

Neutron = ?

Mass number = Proton + Neutron

21 = 10 + Neutron

Collect like terms

21 – 10 = Neutron

Neutron = 11

3. Determination of the number electrons.

For a neutral atom, the number of protons and electrons are equal.

Proton = 10

Electron = Proton = 10

Therefore, the atom has:

1. Proton = 10

2. Neutron = 11

3. Proton = 10

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