Which of the following group is NOT Dobereiner Triads?
........... is not a sub atomic particle of an atom.
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......... is a deliquescent compound.
The mass number of an isotope of an element is 298. If its nucleus has 189 neutrons, what is its atomic number?
Constantan is alloyed from ...... metals.
Give an example of a salt which gives an aqueous solution of pH less than 7.
The atoms of Germanium, Arsenic, Selenium and Bromine contain ...... shells.
The electronic dot and cross structure of ethene is ............
The force that a neutron exerts on a proton inside an atom is: