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Protectionism is a government philosophy towards foreign trade. According to this philosophy, governments should use tariffs and quotas to protect domestic firms from foreign competiti...

A barrier to entry is an obstacle that prevents a new entrant from joining a market. They exist within both oligopolistic and monopolistic market structures. Barriers to entry matter b...

Overall, the general trend is an increase across the period.

The decrease in shielding (as outer electrons are less influenced by the nucleus) is outweighed by an increased nuclear charge...

To solve equations like this we need to get the equation in terms of one trigonometric function, ie one of sin(x), cos(x) or tan(x)

It is usually easiest to get everything in terms of wha...

Hybridisation is a chemical phenomenon that occurs in certain atoms, whereby atomic orbitals 'mix' or 'hybridise' from their usual arrangement to form a more energetically-favourable orbital arrangement. ...