(B1) PERIODIC TABLE Pg. 82 to 85

Q.1 NAME THE ELEMENTS IN PERIOD 1.

• A. H and He
• B.Li and Ne
• c.Na and Ar
• D.K and Kr

Q.2 HOW MANY ELEMENTS ARE THERE IN PERIOD 2.

• A.2
• B.8
• C.18
• D.32

Q.3.HE ARRANGED THE ELEMENTS IN AN INCREASING ORDER OF THEIR ATOMIC NUMBER .

• A. Dobereiner
• B. Moseley
• C. Mendeleev
• D. Newland

Q-4. Name the metalloid in the 3rd Period?

• A.SODIUM
• B.SILICON
• C.MAGNESIUM
• D.ALUMINIUM

Q.5 THERE ARE ------------ PERIODS AND---------- GROUPS IN THE MODERN PERIODIC TABLE.

• A.6 and 19
• B.5 and 17
• C.7 and 18
• D.8 and 20