What is an atom?
Atoms are the smallest particle of matter that cannot be divided and have a nucleus which contains protons and neutrons with electrons surrounding it in energy levels.
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The student did another experiment using 20 cm3 of sodium hydroxide solution with a concentration of 0.18 mol/dm3 . Relative formula mass (Mr) of NaOH = 40 Calculate the mass of sodium hydroxide in 20 cm3 of this solution.