46. An element 'X' forms an oxide with formula
(a) State the valency of X,
(b) Write the formula of
(i) chloride X. (ii) sulphate of X
47. (a) Define the term mole.
(b) Calculate the no. of
(i) atoms
(ii) molecules in 124 grams of phosphorus.
(Given atomic mass of P = 31.0 u, )
48 (a) What was Thomson's model of an atom?
(b) Write any two observations of Rutherford's model or atom.
49. . What were the conclusions of Rutherford's particle scattering experiment.
50. The number of electrons, protons and neutrons of elements are given below:
| Element | A | B | C | D | E |
| Electrons | 4 | 18 | 17 | 11 | 17 |
| Protons | 6 | 18 | 17 | 9 | 17 |
| Neutrons | 6 | 22 | 20 | 10 | 18 |
(a) Which of them is a cation?
(b) Which of them is an anion?
(c) Which is an atom of an Inert gas?
Dear Student,
Kindly find the answer of Q.No. 48 and rest you please ask in the different thread
Kindly find the answer of Q.No. 48 and rest you please ask in the different thread
The major features of the Rutherford atomic model are as follows.
1. All protons are present inside the nucleus, which is situated at the centre of the atom.
2. Electrons reside outside the nucleus and revolve around the nucleus in well-defined orbits.
3. The size of the nucleus is very small in comparison to the size of an atom. As per Rutherfords calculations, the size of the nucleus is 105 times smaller than an atom.
4. As the mass of the electron is negligible in comparison to the mass of the proton, almost all the mass of the atom is concentrated in the nucleus.
