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3 years ago

Most neutral atoms of argon have an atomic mass of 40 amu and an atomic number of 18. what are these atoms composed of?

Chemistry

1 answer:

Eduardwww [97]3 years ago

6 0

Answer:

B.18 protons 22 neutrons 18 electrons

Explanation:

Neutral atom of Argon;

Atomic mass = 40amu

Atomic number = 18

Let us find the number of the subatomic particles;

Protons are the positively charged particles in an atom

Electrons are the negatively charged particles

Neutrons do not carry any charges.

Now;

Atomic mass = number of protons + number of neutrons

Atomic number = number of protons

number of protons = 18

In a neutral atom, number of protons equals number of electrons

number of electrons = 18

Number of neutrons = atomic mass - atomic number

Number of neutrons = 40 - 18 = 22

18 protons, 18 electrons and 22 neutrons

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