Each type of ____ on the periodic table shows a ____ and two numbers. The symbol is usually one or two letters. Only the first letter will be a capital, second letters are lower case for example Pb, Cl . This symbol is used to represent that element in formulae. The two numbers displayed are called the atomic number and the ____. The ____ of the two numbers is always the atomic number. The periodic table is organised by atomic number from top to bottom and left to write . An atom's ____ is determined by its atomic number. For example, element number 5 - Boron - has the atomic number 5. The ____ represents the number of protons that are found in the ____ of that atom. It also tells you how many ____ are found in the ____ around the nucleus. Atoms start off with the same number of negative electrons as positive protons in their nucleus. This makes them ____ charged as they have equal numbers of positives and negatives. ____ are atoms that have gained or lost electrons. The atomic mass is the number of protons and ____ in the nucleus.

Y10 Review of basic Atomic Structure

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