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Electrons are spread around the atom, in layers outside of the nucleus (which holds the protons and the neutrons). These layers are called shells. The innermost shell can only hold 2 electrons, the other ...

An alkane is a chain of carbons connected together by single bonds (-C-C-C-C-C-). All carbons have to have 4 bonds, so the carbons in the middle of the chain are attached to two other carbons, and two oth...

Electron pair donor

• The independent variable is what you change throughout the experiment. Some examples of this may be temperature, pH, light levels or time. • The dependent variable is what is being measured. This is exp...

In an atom, protons have a +1 charge. Electrons that orbit the nucleus have a -1 charge, the number of electrons equals the number of protons so the charges cancel.