Q.1.
The following elements are named after countries except .......
Q.2.
In the periodic table, the elements are arranged in order of increasing .......
Q.3.
The name of a gas used in weather balloons is .......
Q.4.
Li, Na, K and Cs are group 1 elements. The most reactive is .......
Q.5.
Which of the following is a halogen?
Q.6.
Lithium floats on water as it .......
Q.7.
The name of the element with the symbol Na is .......
Q.8.
A pure substance in which all of the atoms are identical is a description of .......
Q.9.
The elements in group 7 of the periodic table are .......
Q.10.
The following elements are named after famous scientists except .......