(a) In thegold foil experiment , what observations led Rutherford to conclude that (i) Most of the space inside the atom is hollow (ii) The central protion of the atom is positively charged. (iii) volume occupied by the nucleus is very small as compared to the total volume of the atom (iv) almost the entire mass of the atom concentrated at its centre. (b) If bromine atom is available in the form of two isotopes overset(79)underset(35)Br(49.7%) and overset(81)underset(35)Br (50.3%) calculate the average atomic mass of bromine atom.

(a) In thegold foil experiment , what observations led Rutherford to c

1.	(a) In thegold foil experiment , what observations led Rutherford to conclude that (i) Most of the space inside the atom is hollow (ii) The central protion of the atom is positively charged. (iii) volume occupied by the nucleus is very small as compared to the total volume of the atom (iv) almost the entire mass of the atom concentrated at its centre. (b) If bromine atom is available in the form of two isotopes overset(79)underset(35)Br(49.7%) and overset(81)underset(35)Br (50.3%) calculate the average atomic mass of bromine atom.
Answer» SOLUTION :(a) (i) Most o fthe `alpha` particles passed through the foil undeflected (ii) some `alpha` particles (POSITIVELY charged ) were delfected and a few CAME back in the same dierction . The atom thios is known as nucleus. (iii) The number of `alpha` aparticles which were delfected back was very small (iv) since th amss of hte atom is mainly due to positiviley chrged protons (neutons were not known at that time) this means that the ENTIRE mass of the atom is concentrated in the center of the atom (B) % of Br isotope with massnumber 79 =49.7 % of Br isotope with mass number 81 =50.3