Identify the correct option that contains group - I elements arranged in the increasing order of their atomic number.

Li, Na, K, Rb, Fr

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Be, Mg, Ca, Sr, Ra

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Fr, Rb, K, Na, Li

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F, Cl, Br, I, At

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Solution

The correct option is A Li, Na, K, Rb, Fr
Group - I of the periodic table contains lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs) and francium(Fr) with atomic numbers as 3, 11, 19, 37, 55 and 87 respectively.

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Identify the correct option that contains group - I elements arranged in the increasing order of their atomic number.

The correct option is A Li, Na, K, Rb, FrGroup - I of the periodic table contains lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs) and francium(Fr) with atomic numbers as 3, 11, 19, 37, 55 and 87 respectively.

The correct option is A Li, Na, K, Rb, Fr
Group - I of the periodic table contains lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs) and francium(Fr) with atomic numbers as 3, 11, 19, 37, 55 and 87 respectively.