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Who discovered electron ?
J.J Thomson
What is the center of atom ?
Nucleus
Who discovered neutron ?
James Chandwick
Who discovered proton ?
Ernest Rutherford
Elements that only consist of same atoms we called as ?
Pure elements
How many carrat of pure gold ?
24
What are atoms ?
Smallest molecules
18 carat of gold has purity of ... ?
75%
pure silver has purity ... %
92.5%
what is mean translucent ?
light through
which element mixed with carbon in diamond makes them blue ?
Boron
the rarest diamond is .... colour
green
how many percent salts is seawater ?
3.5%
how many percent sodium chloride in seawater ?
68%
