Question

Numerous forms of the periodic table have been devised from time to time.
which is most convenient and widely used is the long or extended from of periodic table. The
aufbau principle and the electronic configuration of atoms provide a theoretical foundation for
the periodic classification. The horizontal rows are called periods. There are altogether seve
periods. The first period consists of 2 elements. The subsequent periods consists of 8.8.18, 18
and 32 elements respectively. The seventh period is incomplete and like the sixth period would
have maximum of 32 elements. Elements having similar outer electronic configurations in their
atoms are grouped in vertical columns. These are referred to as groups or families. According to
the recommendations of IUPAC, the groups are numbered 1 to 18 replacing the older notation of
groups 0, IA, IIA, ... VIIA, VIII, IB.....VIIB. Each successive period in the periodic table is
associated with the filling up next higher principal energy level following aufbau sequence.
The number of elements in each period is twice the number of atomic orbitals available in the
energy level that is being filled. All the elements are classified into four blocks, ie, s-block,
p-block, d-block, and f-block depending on the type of atomic orbitals that are being filled with
electrons.​

Answer 1

Answer:

The modern periodic table by Mendeleev is most convenint

Explanation:

Hope it helps:)