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

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Which of the following elements does not exhibit electrovalency?

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Important Questions on Structure of Atom

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 43

The number of valence electrons in a graphite atom is:

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 44

The atomic number of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is:

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 45

The number of valence electrons in a sulphide ion,

S^{2 -}

, is:

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 46

For an element, Z = 9. The valency of this element will be:

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 47

Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be:

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 48

The four atomic species can be represented as follows. Out of these, the two species which can be termed isobars are :

(i) ${}_{60}^{201}X$ (ii) ${}_{61}^{200}X$ (iii) ${}_{58}^{200}X$ (iv) ${}_{60}^{203}X$

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 49

There are four elements P, Q, R and S having atomic numbers of

4, 18, 10

and

16

respectively. The element which can exhibit covalency as well as electrovalency will be:

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 50

The atomic number of an element X is

8

and that of element Y is

4

. Both these elements can exhibit a valency of :