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8 questions
Which one of the following is a Dobereiner Triad?
Na,Ca,Al
Li,Na,Ca
Li,Na,K
F,Cl,Br
In Newlands classification Periodicity of properties is lost after_______element.
In Mendeleev's Periodic Table how many periods and groups are present?
6 periods, 8 groups
6 groups, 8 periods
7 periods, 8 groups
7 groups, 8 periods
Newland classified ________ elements.
63
118
65
56
According to Mendeleev's periodic law, Properties of elements are periodic functions of their increasing_________
Eka silicone is now called
Germanium
Aluminium
Gallium
Scandium
In Mendeleev's periodic table, the position of ________ was not defined
Mendeleef classified _______elements
56
63
65
36
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