The alkaline earth metals show a valency of
+1
-1
+2
-2
Which bond is formed by the transfer of electrons from one atom of an element to another?
Ionic bond
Covalent bond
Co-ordinate bond
Dative bond
The maximum number of electrons accommodated in a given orbit is given by a formula
n2
2n2
3n2
4n2
Ionic compounds have
Low density
Soft character
Insolubility water
High melting and boiling point
The maximum number of electrons which can be accomodated in L shell is
2
8
18
32
The source of the sun's energy is based on
Nuclear fission
Nuclear fusion
Radioactivity
Radioactive radiation
The unit for describing atomic mass is
gram
kilogram
atomic mass unit
milligram
Who gave the name nucleus?
Goldstein
J.J.Thomson
Rutherford
G.J.Stoney
Who named 'atom'?
John Dalton
Democritus
Bohr
The shells or orbits are also known as
Circular path
Surrounding path
Electron path
Energy levels