Give reason: Mendeleev’s periodic law was modified into modern periodic law.

D) both B and C

C) atomic numbers

Features of Mendeleev’s periodic table: In Mendeleev’s periodic table, all 63 elements were arranged in an increasing order of their atomic masses. The serial or ordinal number of an element in...

Mendeleev’s periodic table was readily accepted by scientific community due to the following advantages: i. Mendeleev had left some gaps corresponding to certain atomic numbers in the periodic table so as...

Elements present in the first period i.e., H and He contain only one shell which is also their valence shell and can accommodate maximum two electrons. As first shell can accommodate only...

i. First period  ii. f-Block

Correct option is (C) 63 At that time, Mendeleev's periodic table had 63 elements.

Correct option is: (A) atomic weights According to Mendeleev's periodic law, the Physical and Chemical properties of elements are the periodic function of their atomic weight

The Modern periodic table removed various anomalies of Mendeleev’s periodic table as follows:  i. All isotopes of the same element have different atomic masses but same atomic number. Therefore, they occupy...