What is the mass number of element X which has 8 electrons and 8 neutrons?
16

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Solution

The correct option is A 16
Mass number is the total number of protons and neutrons present in the nucleus of an atom. It is denoted by A.

For the given element X,
Number of electrons = 8
Number of electrons = Number of protons
Number of neutrons = 8
Mass number = Number of protons + number of neutrons
Therefore, mass number = 16

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The composition of two atomic particles is given below :

$\begin{matrix} X & Y Protons : & 8 & 8 Neutrons : & 8 & 9 Electrons : & 8 & 8 \end{matrix}$

(i) What is the mass number of X ?

(ii) What is the mass number of Y ?

(iii) What is the relation between X and Y ?

(iv) which element/elements do they represent?

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