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C5:Periodic Classification of Elements

1.) How many periods and groups are present in the periodic table?

a) 7 periods and 18 groups

b) 8 periods and 7 groups ा

c) 8 periods and 17 groups

d) 18 periods and 7 groups

2.)Which of the following forms the basis of the modern periodic table?

a) Atomic mass

b) Atomic number

c)Number of nucleons

d) All of these

3.)What happens to the electropositive character of elements on moving from left to right in a periodic table?

a) Increase

b) Decreases

c)First increases than decreases

d) First decreases than increases

4.) The electronic configuration of an element M is 2, 8, 4. In modern periodic table, the element M is placed in

a) 4th group

b) 2nd group

c) 14th group

d) 18th group

5.) Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen?

a) O < F < N

b) N < F < O

c) O < N < F

d) F < O < N

6.) What is the other name for group 18th elements?

a) Noble gases

b) Alkali metals

c) Alkali earth metals

d) Halogens

7.) Which of the following is the most reactive element of the group 17?

a) Oxygen

b) Sodium

C) Fluorine

d) Magnesium

8.) Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as

a) Na

b) Mg

c)Al

d)Si

9.) Which group elements are called transition metals?

3a)Group number 1 to 2

b) Group number 13 to 18

c)Group number 3 to 12

d)Group number 1 to 8

10.) Which of the following elements has 2 shells and both are completely filled?

a) Helium

b) Neon

c Calcium>

d) Boron

11.) Which of the following is the atomic number of an element that forms basic oxide?

a) 18

b) 17

19

d) 15

12.) From which of the following substance pencil lead is formed? The elements A, B and C belong to group 2, 14 and 16 respectively, of the periodic table. Which of the two elements will form covalent bonds?

a) A and B

b) B and C

c) C and A

d) None of these

13.) Which of the following does not decrease while moving down the group of the periodic table?

a) Atomic radius

b) Metallic character

c) Number of shells in the atom

d) Valence electrons

14.) An element X belongs to the 3rd period and 1st group of the periodic table. What is the number of valence electrons in its atom?

a) 1

b)3

c) 6

d) 8

15.)An element M is in group 13th of the periodic table, the formula for its oxide is

a) MO

b)M2O3

c)M3O2

d)None of these

Show Result

1. A
2. B
3. B
4. C
5. D
6. A
7. C
8. B
9. C
10. B
11. C
12. B
13. D
14. A
15. B

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