Question

Write two properties on which mendeleev's periodic table is based

Answer 1

Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table.

Gaps and predictions Sometimes this method of arranging elements meant there were gaps in his horizontal rows or 'periods'. But instead of seeing this as a problem, Mendeleev thought it simply meant that the elements which belonged in the gaps had not yet been discovered. He was also able to work out the atomic mass of the missing elements, and so predict their properties.

Answer 2

Hi I think the answer is

1-The property of elements are the periodic functions of their atomic masses.

2-The elements with similar physical and chemical properties came under same group.

Also,for extra knowledge

- Mendeleev arranged all the 63 known elements in there increasing atomic masses.

- The table consists of vertical columns called 'groups' and horizontal rows are called 'period'.

- Mendeleev's left some blank space for undiscovered elements.

- Mendeleev predicted the discovery of some elements and named them as eka-boron,eka-aluminium and eka-silicon.

- Noble gases discovered later could be placed without disturbing the existing order.

Thanks for reading.

HOPE IT HEPL YOU.