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Genes are sections of our DNA that have a specific genetic code.  When you're born you get a copy of each gene from your mother and a copy of each gene from your father.  These copies are called allele...

Aromatic compounds contain a ring-structre e.g. Benzene whereas Aliphatic molecules have a straight chain structure e.g. Butane.

Atoms are small particles that make up everything.  If you picture an object made up from mini-footballs then that's what the atoms look like that make up the object just on a much, much smaller scale....

To start solving a question like this you want to do it in a set of steps:

Step 1: Get rid of the division.  To do thsi you need to do the opposite function.  The opposite of division is ...

There are three things to consider every single time relative reactivity is unknown: atomic radius, shielding, and number of electrons.

The reactivity is the halogens ability ...