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

MEDIUM

9th CBSE

IMPORTANT

Earn 100

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

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 35

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

EASY

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:

EASY

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?

MEDIUM

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 39

The radioactive isotope used in the treatment of cancer is:

HARD

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 40

Elements having valency 'one' are:

MEDIUM

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IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 41

In a sample of ethyl ethanoate (

{CH}_{3} {COOC}_{2} H_{5}

), the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

MEDIUM

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 42

Which of the following elements does not exhibit electrovalency?