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As you go down the group, what changes? The number of shells.

As you go down the group, what doesn't change? The number of electrons in the outer shell - it is always one.

For group 1, they ...

Two methods for simultaneous equations: making them equal to each or substitution. If they both have a common term, for example "y", then you can do substitution, otheriwise find a way to make t...

Ask the student: what other option is there? What are the differences between the two? 

Answer: Humans have a small surface area to volume ratio, so diffusion alone is not enough to meet the high m...

There are three verbs in this sentence: se dépêcher, éviter and arriver. Se dépêcher is conjugated using the present simple tense because the action is currently happening. Eviter et arriver are both in t...

At first glance, reading poetry can be daunting and analysing poetry can be difficult, I like to think of a poem as a tight knot, which, as a reader, you have to slowly pick apart and untangle. Below I ha...