Lithium resembled with with…… according to J.Newlands.
a) sodium
b) carbon
c) oxygen
d) fluorine
Certain chemical and physical were repeated at regular intervals mentioned by…….. 1869.
a) Dmitri Mendeleev
b) Lother Meyer
c) a & b both
d) All of these
Lother Meyer was a ……… scientist.
a) German
b) English
c) Russian
d) Italian
….……. elements were arranged in periods and groups initially.
a) 105
b) 84
c) 98
d) 65
….…….. arranged elements in the form of table firstly.
a) J.W.Dobereiner
b) Mendeleev
c) Lother Meyer
d) Lavoisier
Mendeleev’s classification was based on….…
a) atomic number
b) formula mass
c) atomic mass
d) all of these
