Question

PLEASE HELP ME I WILL GIVE BRAINLIEST IN A HEAR BEAT. In 1869, Mendeleev organized a periodic table based on atomic weights and arranged elements with similar properties under each other. Gaps were left for elements that were unknown at that time but Mendeleev was able to predict their properties. This was important because it supported the concept of

Answer 1

Answer:

This was important because it supported the concept of discovery of new elements

Explanation:

Mendleev left gaps in his table not discovered at that time, but he predicted the properties (chemical and physical) of undiscovered elements. Mendeleev left the gap next to silicon and named the undiscovered element as 'eka-silicon', the element germanium was discovered later.

Answer 2

Answer:

It supported the concept of periodicity

Explanation:

Mendeleev studied the change in the chemical properties of substances based on the increase of the atomic masses of chemical elements, and analyzed the behavior of the valence of chemical elements, the properties and composition of the compounds they form.

Note that by increasing the atomic number the composition of the oxides of the chemical elements repeats every certain amount of chemical elements, that is, that the properties of simple bodies as well as the shapes and properties of the elements are in periodic dependence of the atomic weights of the elements. This is known as Mendeleev's periodic law, conforming around 1905, after the discovery of noble gases