PERIODIC CLASSIFICATION-CLASS-X

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

• a) 7 periods and 18 groups

• b)7 periods and 8 groups

• c) 7 periods and 7 groups

• d) 8 periods and 8 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) 4^th group

• b) 2^nd group

• c) 14^th group

• d) 18^th group

5) What is the other name for group 18^th elements?

• a) Noble gases

• b) Alkali metals

• c) Alkali earth metals

• d) Halogens

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

• a) Oxygen

• b) Sodium

• c) Fluorine

• d) Magnesium

7.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

8.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

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

• a) 1

• b) 3

• c) 6

• d) 8

10.At the time of Mendeleev, the number of elements known was

• (a) 63

• (b) 65

• (c) 62

• (d) 64