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Isotope | Symbol | Mass no. | Atomic no. | No. of electrons | No. of protons | No. of neutrons |

Hydrogen | H | 1 | 1 | 1 | 1 | 0 |

Deuterium | D | 2 | 1 | 1 | 1 | 1 |

Tritium | T | 3 | 1 | 1 | 1 | 2 |

- What are the canal rays?
- If an atom contains one electron and one proton, will it carry any charge or not?
- On the basis of Thompson’s model of an atom, explain how the atom is neutral as a whole.
- On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?
- Draw a sketch of Bohr’s model of an atom with three shells.
- What do you think would be the observation if the ?– particle scattering experiment is carried out using a foil of a metal other than gold?
- Name the three subatomic particles of an atom.
- Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
- Write the distribution of electrons in Carbon and Sodium atoms.
- If K and L shells of an atom are full, then what would be the total number of electrons in the atom?
- How will you find the valency of chlorine, sulphur and magnesium?
- 1. If the number of electrons in an atom is 8 and number of protons is also 8, then (i) What is the atomic number of the atom? and (ii) What is the charge on the atom?
- With the help of given Table, find out the mass number of oxygen and sulphur atom.
- Write the electronic configuration of any one pair of isotopes and isobar.

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