ASSIGNMENT
PERIODIC TABLE
Q.1 GIVE REASON FOR THE FOLLOWIMG:
A) Why criterion of classification was changed by Henry Moseley?
B) Why some placed were left vacant by Mendeleev in his Periodic table
Q.2 NAME THE FOLLOWIG:
A) SHORTEST PERIOD OF PERIODIC TABLE
B) LONGEST PERIOD IN PERIODIC TABLE
C) NOBLE GAS HAVING ONE SHELL.
D) FIRST ELEMENT OF PERIOD 4
Q.3 ANSWER THE FOLLOWING :
A) HOW MANY ELEMENTS ARE THERE IN GROUP 1
B) STATE MODERN PERIODIC LAW.