Chapter 4: Structure of the Atom

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Q
Structure of Atom

Question:

Composition of the nuclei of two atomic species X and Y are given as under:

Give the mass numbers of X and Y. What is the relation between the two species?

Answer:

The atomic number of the element is equal to the number of protons present in the nucleus of the atom. The number of protons is equal to the number of electrons present in the atom.

Atomic number (Z)= Number of Protons = Number of Electrons

The mass number is defined as the total number of nucleons, which is the total number of protons and neutrons present in the nucleus of the atom.

Mass number(A)= Number of Protons + Number of Neutrons

The element is represented as shown below:

The isotopes are the variant of the particular chemical element which has the same atomic number but a different mass number. 

According to the given question, 

X contains 6 protons. So, its atomic number is 6.

Mass number of X = 6 + 6 = 12

Y contains 6 protons. So, its atomic number is 6.

Mass number of Y = 6 + 8 = 14

The X and Y have the same atomic number but different mass numbers. Hence, X and Y are isotopes.


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