Chemistry 4: Chemical Patterens

The Periodic Table

An element is made of only one kind of atom. All the atoms of an element have the same number of protons.

different elements have different proton numbers and they're arranged in order of increasing proton number in the modern periodic table. This gives repeating patterns in the properties of elements.

you can use the periodic table as a reference table to obtain the following information about the elements:

Relative atomic mass - the total number of protons and neutrons in an atom.
Symbol
Name
Atomic (proton) number - the number of protons (and electrons) in an atom.

you can also tell if the elements are metals or non-metals by looking at their position in the table.

Groups

a vertical column of elements is called a group. Elements that are in the same group have similar properties.

Group 1 elements include:

Lithium (Li)
Sodium (Na)
Potassium (K)

Periods

A horizontal row of elements is called a period. Examples of elements in the same period are lithium (Li), carbon (C) and neon (Ne).

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