1
Elements of group (1A) are known as...........
2
Alkali metals are considered from........... block groups.
3
Elements of group (1A) are dissolved in water forming......... solutions.
4
Hydrogen element belongs to..........
5
Sodium and potassium are kept under the surface of..........
6
All of the following are from the properties of alkali metals except they.......
7
......... element has higher chemical reactivity.
8
The strongest (most active) metal lies in group..........
9
The metallic property of alkali metals increases by increasing their.........
10
The gas evolved on reacting alkali metal with water is.........
11
Most alkali metals have........ density.
12
All these alkali metals float on water surface except..........
13
........... form positive ions during the chemical reactions.
14
Elements of group (7A) are known as...........
15
The outermost energy level of any halogen contains......... electrons.
16
............. is considered from halogens.
17
Halogens are considered from........block groups.
18
All these halogens exist in a gaseous state except...........
19
The halogen which exists in a liquid state is..........
20
The molecule of halogen is composed of....... atom(s).
21
............ in its salt solutions.
22
All these elements can replace bromine in its salt solution except........
23
The halogen, which can be prepared artificially is.........
24
Bromine is obtained when chlorine reacts with ..........solution.
25
Liquid sodium is used in.........
26
The element, which is used in the manufacture of transistor is...........
27
........rays are used in sterilizing food.
28
Comea is preserved under the surface of...........
29
The boiling point of liquefied nitrogen is..........
