Question

An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong? *

(a) 4th group

(b) 6th group

(c) 3rd group

(d) 2nd group

7. The arrangement of elements in the Modem Periodic Table is based on their *

(a) increasing atomic mass in the period

(b) increasing atomic number in the horizontal rows

(c) increasing atomic number in the vertical columns

(d) increasing atomic mass in the group

8. Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table? *

(a) Group 8

(b) Group 2

(c) Group 18

(d) Group 10

9. Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If atomic number of carbon is 6, the atomic number of silicon is *

a) 7

(b) 14

(c) 24

(d) 16

10. An element X from group 2 of the Periodic Table reacts with Y from group 17 to form a compound. Give the formula of the compound. *

(a) XY2

(b) XY

(c) X2Y

(d) (XY)2

 

This is a required question

11. An element ‘A’ belongs to the third period and group 16 of the Periodic Table. Find out the valency of A. *

(a) Valency = 6

(b) Valency = 2

(c) Valency = 1

(d) Valency = 3

12. Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group? *

(a) The chemical reactivity of metals increases.

(b) The metallic character of elements increases.

(c) The size of the atom increases.

(d) The valence electrons increase.

 

This is a required question

13. The atom of an element has electronic con-figuration 2, 8, 7. To which of the following elements would it be chemically similar? *

(a) N(7)

(b) P(15)

(c) Na(11)

(d) F (9)

15.On moving from left to right in a period in the periodic table, the size of the atom *

(a) increases

(b) decreases

(c) does not change appreciably

(d) first decreases and then increases.

16. An element belongs to period 2 and group 2 th number of valence electrons in the atoms of this element is. *

a. 2

b. 4

c. 3

d. 1

​

Answer 1

Answer:

d. 1

a. 2

Explanation:

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