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Column I

Column 2

Column 3

i. Triad

a. Lightest and negatively charged particle in all the atoms.

1. Mendeleev

ii. Octave

b. Concentrated mass and positive charge.

2. Thomson

iii. Atomic Number

c. Average of the first and the third atomic mass

3. Newlands.

iv. Period

d. Properties of the eight element similar to the first.

4. Rutherford.

v. Nucleus

e. Positive charge on the nucleus.

5. Dobereiner

vi. Electron

f. Sequential change in molecular formulae

6. Moseley

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Ans. (i – c – 5 ) , (ii – d – 3) , (iii – e – 6 ) , (iv – f – 1) , (v – b – 4), (vi - a – 2).

Column 1

Column 2

Column 3

i. Triad c. Average of the first and the third atomic mass 5. Dobereiner
ii. Octave d. Properties of the eight-element similar to the first. 3. Newlands
iii. Atomic Number e. Positive charge on the nucleus. 6. Moseley
iv. Period f. Sequential change in molecular formulae 1. Mendeleev
v. Nucleus b. Concentrated mass and positive charge 4. Rutherford
vi. Electron a. Lightest and negatively charged particle in all the atoms 2. Thomson
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