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Fleming's Left Hand Rule

Lithium and s...

Question

Lithium and sodium have the same number of ___.

A

valence electrons

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B

electrons

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C

shells

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D

protons

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Solution

The correct option is A
valence electrons

Lithium and sodium both are in the first group, so both have the same number of valence electrons,i.e., 1.

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According to Newland’s Law of Octaves, the properties of lithium and sodium were found to be same because sodium is the eighth element after lithium.

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Q. Lithium, sodium and potassium form a Dobereiner’s triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium.

Q. Modern periodic table is arranged in order of increasing atomic numbers and after filling of 7 elements in the second period after lithium the eighth element sodium has same property as that of the lithium and hence placed just below lithium.

Q. State true or false.
According to Newlands’ Law of Octaves, the properties of lithium and sodium were found to be same because sodium is the eighth element after lithium.

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