Questions :

1. The number of electrons in Na+ (atomic number = 11) are
(a) 11
(b) 10
(c) 12
(d) 13

2. 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:
(a) -P
(b) Q
(c) R
(d) S

3. The maximum number of electron in 3rd shell can be
(a) 8
(b) 18
(c) 32
(d) 50

4. The valency of Al with atomic number 13 is
(a) 3
(b) 2
(c) 4
(d) 1

5. Which of the following is used in radio carbon dating
(a) 12C6
(b) 13C6
(c) 14C6
(d) 238C92

6. The maximum number of electrons in last shell is equal to
(a) 8
(b) 18
(c) 2
(d) 1

7. The mass number of two atoms X and Y is the same (40 each) but their atomic numbers are different (being 20 and 18 respectively). X and Y are examples of :
(a) chemically similar atoms
(b) isotopes
(c) solid and liquid metals
(d) isobars

8. Name the element which has electronic configuration 2, 8, 8,1
(a) K
(b) Na
(c) Ca
(d) Ar

9. Anode rays are produced when
(a) cathode is perforated
(b) anode is perforated
(c) when low voltage is passed
(d) when pressure is high

10. The number of electrons in F-, if atomic number of F is 9 are
(a) 9
(b) 8
(c) 10
(d) 11

Chapter 4 Structure of Atom Quiz 2| Class 9th

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