Question

the atomic number of an element is 23 and its mass number is 56
a. How many protons and electrons does an atom of this element have?
b. How many neuterons does this atom have? ​

Answer 1

Answer:

Electrons - 23

protons -23

neutrons - 56-23

=33

Answer 2

Given :

• Atomic number of an element = 23
• Mass number of an element = 56

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To find :

• How many protons and electrons does an atom of this element have ?
• How many neuterons does this atom have?

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Solution :

We know -

➻ The Atomic number is equal to the number of protons present in the atom.

$\sf\therefore\:Number~of~Protons~=~Atomic~number$

$\small{\underline{\boxed{\mathrm{\to\:Number~of~protons~=~23}}}}$

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Again we know that ,

➻ An atom is always neutral since number of electrons is equal to number of protons.

$\sf\therefore\:Number~of~Electrons~=~Number~of~Protons$

$\small{\underline{\boxed{\mathrm{\to\:Number~of~Electrons~=~23}}}}$

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We‎ know -

➻ Number of protons + Number of neutrons = Mass number

$\sf\therefore\:Mass~number~=~No~Protons+No~Neutrons$

$\sf\to\:56~=~23+No~Neutrons$

$\sf\to\:No~Neutrons~=~56-23$

$\small{\underline{\boxed{\mathrm{\to\:Number~of~Neutrons~=~33}}}}$

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