Question

Question. 14 (a) Which two criteria did
Mendeleev use to classify the elements in his
Periodic Table?
(b) State Mendeleev's periodic law.
(c) Why could no fixed position be given to
hydrogen in Mendeleev's Periodic Table?
(i) Sizes of their atoms
(ii) Their metallic characters
(iii) Their valencies in forming oxides
(iv) Molecular formulae of their chlorides
(a) The vertical columns in the periodic table
are called 'groups'. The horizontal rows in
the periodic table are called 'periods'.
(b) (i) 'M' and 'N' belong to same
period but group I and II. Therefore, 'N' will
be smaller than ‘M'as atomic size goes on
decreasing from left to right.
(ii) 'M' is more metallic than 'N'. Metallic
character goes on decreasing from left to
right as tendency to lose electrons decreases
due to decrease in atomic size.
(iii) Their valencies are 1 and 2 respectively
in forming oxides. Valency goes on increasing
first
and then decreases.
(iv) MCI, NCI2 are molecular formulae of
their chlorides.
(d) How and why does the atomic size vary as
you go
(i) from left to right along a period?
(ii) down a group?​

Answer 1

Answer:

Sorry I don't know the answer.