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Which of the following are correctly matched?
1. Electron ————————————————————————- J.J Thomson.
2. Proton ——————————————————————————– Dalton.
3. Neutron ——————————————————————- James Chadwick.
Which of the following is/are correct for Thomson model of an atom?
1. An atom consists of a positively charged sphere and the electrons are embedded
in it.
2. The negative and positive charges are unequal in magnitude. So, the atom as a
whole is electrically neutral.
Which of the following is/are correct for observation of Rutherford experiment?
1. Most of the fast moving a-particles passed straight through the gold foil.
2. Some of the a-particles are deflected by the foil by small angles.
3. Surprisingly one out of every 1200 particles appear to rebound.
Which of the following is/are true for electron distribution in shells?
1. It was suggested by Bohr.
2. The maximum number of electrons that can be accommodated in the outermost
orbit is 8.
3. The maximum number of electrons present in a shell is given by the formula
2n (square).
Which of the following are correctly matched?
Element Valency
1. Neon zero
2. Nitrogen five
3. Phosphorus three decimal five
4. Potassium one
Which of the following are correctly matched?
1. Mass number —————————————————————- denoted by M.
2. Atomic number ————————————————————– denoted by z.
3. Isotopes ————————————————————- same atomic number.
4. Isobar ——————————————————————– same atomic mass.