1. The basic unit of matter is _______(a) Element (b) Atom (c) Molecule (d) Electron2. The sub atomic particle revolve around the nucleus is ________(a) Atom (b) Neutron (c) Electron (d) Proton3. __________ is positively charged (a) Proton (b) Electron (c) Molecule (d) Neutron4.The atomic number of an atom is ___________(a) Number of neutrons (b) Number of Protons (c) Total number of Protons and Neutrons (d) Number of atoms5. Nucleons comprises of________________a) Protons and electrons b) Neutrons and electronsc) Protons and neutrons d) Neutrons and Positron6. Atoms which have same atomic number but different mass number are called _______(a) Isobars (b) Isotopes (c) Isotones (d) All of these7. The valency of Magnesium is _______(a) 1 (b) 2 (c) 3 (d) 48. The charge of electron is __________(a) Positive (b) Negative (c) Neutral (d) None of these9. The scientist who discovered the Neutron(a) Dalton (b) Thomson (c) James Chadwick (d) Rutherford10. In which year Dalton atomic theory was proposed(a) 1906 (b) 1808 (c) 1863 (d) 1867​