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An increase in pressure will cause the equilibrium to shift towards the side with the smaller number of molecules. A decrease in pressure causes the equilibrium to shift towards the side with larger number o...

Electrons occupy energy levels/shells. Electrons occupy the lowest level (first one from the nucleus) first which can occupy a maximum of 2 electrons. After the first level, electrons fill up the other shell...

Going down Group 7 in the period table, the mass number increases, so the element becomes heavier. The period increases so the number of shells increase, though they all still require one electron to fill it...

The halogens become less reactive as the group is descended. The halogens react by accepting an electron into its outer shell from another atom. As the halogens are descended, the outer electron shell become...

Both potassium and sodium are in the same group on the periodic table, but have a different atomic structure. Sodium has three outer electron rings, while potassium has 4. Both atoms only have one electron o...