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Number of moles = (0.5 x 100)/1000 = 0.05 moles (1 mark)Molar mass, M, of NaOH = 23 + 16 + 1 = 40 (1 mark)Mass of NaOH needed = moles x M = 0.05 x 40 = 2g (1 mark)correct answer alone scores 3 markscorrect f...

Chlorine has fewer shells than iodine - chlorine has 2 and iodine has 4. We know this by referring to the periodic table. This means its outer electrons are closer to the nucleus .Because they are closer - o...

The type of bonding in sodium chloride is ionic. This sodium atom loses its outer most electron to complete its outer most shell to form a sodium ion (positive) and donates it to the chlorine atom which acce...

The relative atomic mass (A r ) is calculated from 2 things : mass numbers of its isotopes and abundance of these isotopes.Let's use Chlorine as an example. Chlorine naturally exists as two isotopes, (chlori...

All atoms are neutral because all atoms have the same number of protons as they have electrons. Atoms are made up of a nucleus and electrons that surround their nucleus in shells. The nucleus contains proton...