Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 33

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9th CBSE

IMPORTANT

Earn 100

Give the number of protons, neutrons and electrons per atom in the two isotopes of chlorine ${}_{17}^{35}{Cl} and {}_{17}^{37}{Cl}$ .

Important Questions on Structure of Atom

HARD

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 34

What are radioactive isotopes? Give two examples of radioactive isotopes.

MEDIUM

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 34

Give any two uses of radioactive isotopes.

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9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 34

An element Z contains two naturally occurring isotopes

{}_{17}^{35}Z

and

{}_{17}^{37}Z

. If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.

MEDIUM

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 35

Define valency of an element. What valency will be shown by an element having atomic number 14?

HARD

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 35

What is the relation between the valency of an element and the number of valence electrons in its atoms? Explain with examples.

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9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 36

The mass number of two atoms X and Y is the same 40 each but their atomic number are different being 20 and 18 respectively. X and Y are examples of:

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9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 37

Which of the following statement is correct about the atom of an element?

MEDIUM

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 38

There are two species represented as

{}^{35}{Cl}

and

{}^{37}{Cl}

. Which of the following statement is correct regarding these species?