Question

7. In Mendeleev's periodic table, gap was left for
which of the following elements?
a) Scandium
b) Gallium
c) Silicon
d) Vanadium
8. The pair of elements having the same number
of valence electrons:
a) CI, I
b) Na, Ca
c) C, Ge
d) Zn, Mg​

Answer 1

Answer:

a)scandium

b) gallium

8.

a)Cl,I

c)C,Ge

Answer 2

7. In Mendeleev's periodic table, gap was left for

which of the following elements?

a) Scandium

b) Gallium

8. The pair of elements having the same number

of valence electrons:

a) CI, I

Explanation:

• The mendeleev periodic table is one of the most modern form of the periodic table. The different compounds were arranged in the form of of groups and periods.

• In addition to this it has less number of drawbacks as compared to the older forms of the periodic table. both chlorine and iodine have 7 valence electron which are present in the last orbit of the  atom.

To know more,

Write two major shortcomings of mendeleev's periodic table? how ...

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