Atoms and Molecule
Calculate the number of moles for the 84 g of He.
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Number of atoms in 69 g of Na is :
The percentage of sulphur in sulphuric acid is :
Which one of the following was not explained in Rutherford's nuclear model of atom?
Which one of the following is correct about elements?
An atom contains 6 protons and 8 neutrons. What should be its atomic number?
The isotopes contain the same number of____ and different number of______.
Maximum number of electrons present in a shell is given by the formula______.