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) ^{12}C_{6}
(b) ^{13}C_{6}
(c) ^{14}C_{6}
(d) ^{238}C_{92}
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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Question 1 of 10
1. Question
The number of electrons in Na+ (atomic number = 11) are
Correct
The positive charge on Na shows that it contains one less electron. Thus, the new atomic number will be 111 = 10
Incorrect
The positive charge on Na shows that it contains one less electron. Thus, the new atomic number will be 111 = 10

Question 2 of 10
2. Question
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:
Correct
Incorrect

Question 3 of 10
3. Question
The maximum number of electron in 3rd shell can be
Correct
Incorrect

Question 4 of 10
4. Question
The valency of Al with atomic number 13 is
Correct
Electronic configuration of Al = 2, 8, 3. Thus, valency will be 3
Incorrect
Electronic configuration of Al = 2, 8, 3. Thus, valency will be 3

Question 5 of 10
5. Question
Which of the following is used in radio carbon dating
Correct
Incorrect

Question 6 of 10
6. Question
The maximum number of electrons in last shell is equal to
Correct
Incorrect

Question 7 of 10
7. Question
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 :
Correct
Isobars are the elements having different atomic numbers but same mass number.
Incorrect
Isobars are the elements having different atomic numbers but same mass number.

Question 8 of 10
8. Question
Name the element which has electronic configuration 2, 8, 8,1
Correct
The atomic number of Potassium (K) is 19. Therefore the element is 2 + 8 + 8 +1 = 19 = K
Incorrect
The atomic number of Potassium (K) is 19. Therefore the element is 2 + 8 + 8 +1 = 19 = K

Question 9 of 10
9. Question
Anode rays are produced when
Correct
Incorrect

Question 10 of 10
10. Question
The number of electrons in F, if atomic number of F is 9 are
Correct
The negative charge on F shows that it contains one more electrons. Thus, the new atomic number will be 9+1 = 10
Incorrect
The negative charge on F shows that it contains one more electrons. Thus, the new atomic number will be 9+1 = 10