Question

Complete the statement given below on the basis of the Newlands law of classification of elements, the properties of sodium and potassium are similar, because the Potassium is the --------- element, starting from sodium.

Answer 1

Law of Octaves:

• At the time of British chemist John Newlands, 62 elements were known.
• He arranged them in an ascending order based on their increasing atomic masses and observed that every 8th element had similar properties as that of the first one.
• Newlands compared the similarity between the elements to the octaves of music, where every eighth note is comparable to the first.

So, According to the Newlands law of classification of elements, the properties of sodium and potassium are similar, because Potassium is the Eighth element, starting from sodium.