Question

what is Mendeleev's periodic tables ??

Answer 1

short form of periodic table is called mandeleef periodic table

Answer 2

Explanation:

It states that physical and chemical properties of an element are periodic function of their atomic weights.

Uses :- 1. Atomic weights were corrected.

2. Discovery of new elements :- Two consecutive members differ by two or three units in atomic weights. Where these gaps were more places were left vacant.

3. Discovery of 1st two noble gases He and Ar.

Defects :- 1. Position of hydrogen is uncertain.

2. Na separate position of isotope.

3. No separate groups for lanthanoids and actinides.

4. Order of increasing atomic weights is not followed strictly.

Argon :- (39.9)

K :- (39)