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The imperfect tense is used for ongoing actions (e.g. was doing) or actions done regularly in the past (e.g. used to do). It is formed by taking the endings off a verb to form its "stem". For -a...

Barium is in the sixth period, Calcium is in the fourth. Therefore, Barium experiences more shielding, resulting in weaker attraction of the nucleus for outermost electrons.

Alpha radiation isn't very penetrating and so is absorbed and stopped by smoke particles. This causes a change in count rate when there is smoke present. This change in count rate allows the alarm to be t...

"Revolutions are like earthquakes." The words of Jack Goldstone allows us to view revolutions as unpredictable and complex processes. He argues that when they occur, they can often be a shock to...

In order to prove this we can write a general expression of an odd number in terms of n, e.g - 2n+1Square this 'odd number': (2n+1)^2, therefore you can write it as (2n+1)(2n+1), then expand (multiply out...