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Which of the following subshells has the lowest energy (in the same energy level)?
Energy change when one electron added to the atom to form anion :
If an atom has 11 protons and 12 neutrons, the mass number is:
A substance has a mass of 1.78 × 10^4 μg and a volume of 500 L. Calculate its specific gravity (given that the density of water is 1.0 g/cm³).
