Question

Represent the atom X with its atomic
number and mass numbers as 15 and
31 respectively
​

Answer 1

It is given that :-

• atomic number = 15

• mass numbers = 31

Now , we will represent the element :-

$\sf \displaystyle \large {X^{31}_{15}}$

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Additional Information :-

Atom :-

Atoms are basic building blocks of matter.They are smallest units of matter.

Atoms are composed of three elementary particles:-

1. protons ( positively charged)
2. electrons ( negatively charged)
3. neutrons ( neutral )

Atomic Number :-

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

For example :- Atomic number of Boron is 5. This means that total number of protons present in Boron is 5.

Mass Number :

Mass Number is the total number of protons and neutrons present in an atom.

Mass Number = number of protons + number of neutrons