Q29 of 149 Page 210

What are isobars? Explain with an example.

The atoms of different elements having different atomic numbers but the same mass number (or same atomic mass) are known as isobars. Example of isobar is Cl, S etc.


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27

Hydrogen has three isotopes written as:


Explain why:


(i) these isotopes have almost identical chemical properties.


(ii) they are electrically neutral.

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Given that the percentage abundance of the isotope is 90% and that of the isotope is 10%, calculate the average atomic mass of neon.

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For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.

 31

An element has Z = 7. What is the valency of the element? Also name the element.