Fill in the blanks in the following statements
(a) Rutherford’s α-particle scattering experiment led to the discovery of the __________.
Ans. atomic nucleus
(b) Isotopes have same __________ but different __________.
Ans. atomic number, mass number
(c) Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will
be __________ and __________ respectively.
Ans. 0 and 1.
(d) The electronic configuration of silicon is __________ and that of Sulphur is __________.
Ans. Silicon—2, 8, 4, Sulphur— 2, 8, 6
