The earth is made up of …….% of aluminum.
a) 5
b) 8
c) 4
d) 12
The earth is made up of …….% of iron.
a) 5
b) 8
c) 4
d) 12
The earth is made up of …….% of calcium.
a) 5
b) 8
c) 4
d) 12
The earth is said to be made up of less than ……% of potassium, sodium and magnesium.
a) 5
b) 8
c) 4
d) 12
Characteristics of Metals and Non-Metals:
The tendency of an element to lose electrons and forms positive ions is called…character.
a) electropositive
b) metallic
c) electronegative
d) both a and b
