Question

The formation of the centers of the X, Y, and Z atomic species is as follows. Y wix NIN 6 Protons 6 4 Neutrons 7 Calculate (i) Atomic number(ii) mass number. Of X, Y, and Z.​

Answer 1

Explanation:

The composition of the nuclei of two atomic species X and Y are given as under Protons = 6(X): 6(Y) Neutrons = 6(X): 8(Y)

Atomic mass of X = Number of protons + Number of neutrons = 6 + 6 = 12.

Atomic mass of Y = Number of protons + Number of neutrons = 6 + 8 = 14.

These two atomic species, X and Y, have the same atomic number but different mass numbers. Hence, they are isotopes.

Answer 2

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The formation of the centres of the X, Y, and Z atomic species is as follows.

X Y Z

Protons 3 6 7

Neutrons 4 6 7

Answer:

i) The atomic number of X is 3, Y is 6 and Z is 7

ii) The mass number of X is 7, Y is 12 and Z is 14

Explanation:

• The atomic number and the mass number are important quantities used to describe elements
• The chemical properties of elements depend on the atomic number
• The physical properties of elements depend on the mass number
• The atomic number is the same as the number of protons
• X has 3 protons, so it has the atomic number 3
• Y has 6 protons, so it has the atomic number 6
• Z has 7 protons, so it has the atomic number 7
• The mass number is the total number of protons and neutrons which are nucleons
• X has 3+4= 7 nucleons, so it has the mass number 7
• Y has 6+6= 12 nucleons, so it has the mass number 12
• Z has 7+7= 14 nucleons, so it has the mass number 14

The atomic number of X is 3, Y is 6 and Z is 7

The mass number of X is 7, Y is 12 and Z is 14

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