Write true or false for the following statements:

It was assumed by Newlands that only 63 elements existed in nature and no more elements would be discovered in the future.

Which of the following set of elements is written in order of their increasing metallic character?

In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later?

Write true or false for the following statements:

In order to fit elements into his table, Newlands adjusted three elements in the same slot, but also put some unlike elements in the same slot.

Write true or false for the following statements:

In Mendeleev’s periodic table, elements were arranged in the order of their increasing atomic masses and it was also observed that there occurs a periodic recurrence of elements with similar physical and chemical properties.