Question

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Answer 1

1. Triad - c. Average of the first and the third atomic mass - 5. Dobereiner

2. Octave - d. Properties of the eight element similar to the first element - 3.  Newlands

3. Atomic number - e. positive charge on the nucleus - 6. Moseley

4.  Period - f. sequential change in molecular fomulae - 1. Mendleev

5. Nucleus - b. Concentrated mass and positive charge - 4. Rutherford

6. Electron - a. Lightest and negatively charged particles in all the atoms
   - 2. Thomson