Multiple choice

According to Newlands, sodium and lithium are placed in the same column. Which option gives the correct reason?

  1. They have similar properties.

  2. They have the same atomic mass.

  3. They belong to the same triad.

  4. Both had same size.

  5. None of these
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A Correct answer
Explanation

Newlands found that every eighth element has similar physical and chemical properties. If one starts with lithium (atomic mass = 6) and arrange the elements in increasing order of their atomic masses, the eighth element will be sodium (atomic mass = 23). Both elements show the same physical and chemical properties.

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