Which of the following represents the correct electronic configuration.
2,8,9
2,8,8
2,8,10
2,8,11
An atom contains 15 protons and has the mass number 31, the number of neutrons is
15
16
31
46
Only certain special orbits known as discrete orbits of electrons, are allowed inside the atom was proposed by
Rutherford
Neils Bohr
John Dalton
Joseph Priestley
Which one of the following is a correct electronic configuration of sodium.
2,8
8,2,1
2,1,8
2,8,1
Electrons are revolving around the nucleus in a well defined paths known as
Orbits
Orbitals
Ways
Probability
The maximum number of electrons present in a shell is given by the formula
2n
2n²
2n³
2nb
The atomic number and mass number of an atom is 9 and 18 respectively, the number of protons present in that atom is
9
18
8
10
An atom contains 14 protons and 14 neutrons, its atomic number is
14
28
20
The maximum number of electrons that can be accommodated in the outermost orbit is
2
4
6
An isotope which is used in the treatment of goiter.
Iodine
Cobalt
Chlorine
Uranium
