Question

Find the odd one out and give reasons:
(1) Newlands, Moseley. Dobereiner. Mendeleev.
(2) Fluorine, Sulphur. Bromine, Iodine.
(3) Sodium. Aluminium Chlorine, Carbon
4) Nitrogen, Neon, Argon. Helium.
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Answer 1

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Here are odd one out

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1) Moseley.

1. (other tried to classify the elements on the basis of atomic mass except Moseley)

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2)Sulphur.

• (Others are halogens.)

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3)Carbon.

• ( others belong to the third row while Carbon belongs to the second row)

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4)Nitrogen.

• (The others are inert gases except nitrogen)

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Answer 2

Answer:

1. MOSELEY IS THE ODD ONE OUT BECAUSE DOBRENIER , NEWLAND , MENDELEEV WERE CHEMISTS WHEREAS MOSELEY WAS A PHYSICIST.
2. SULPHER IS ODD BECAUSE ALL ARE ARE BELONG TO SAME FAMILY BUT IT BELONGS TO OXYGEN FAMILY
3. The elements given in the series are sodium,aluminium,chlorine, and carbon. As per the location of these elements in the periodic table, among the given series, carbon is considered as odd one out.
4. Nitrogen will be the odd one out because argon, helium and neon are Inert ( noble ) gases. HOPE IT HELPS YOU.