1. Reactivity
- metals and non-metals show different trends
- reactivity increases as you move outwards from the middle of the table
- metals also increase in reactivity as you move down the table
- non-metals increase in reactivity as you move upwards on the table
- the exception to this is the noble gases which are the least reactive elements
2. Ion Charge
- elements ion charges depend on their group number
so all of the elements in group 2 for example, have a charge of +2 when they make ions
3. Melting point
- Moving from the outside towards the middle of the table, melting points of elements increase
- Elements in the middle of the table have the highest melting points
- Noble gases have the lowest melting points
* carbon is an exception to this rule
4. Atomic Radius
- The atomic radius of an element decreases as you move up and to the right on the periodic table
therefore, Helium has the smallest atomic radius while Francium has the largest
5. Ionization Energy
- this is the amount of energy required to remove and electron from an atom
- the amount of energy increases up and to the right
Here, Helium has the highest energy requirement while Francium has the lowest. This is directly opposite from the trend in atomic radius. This is because the smaller the radius, the more attraction is exerted on the electrons from the nucleus. More energy is then needed to launch the electrons away from the atom because of this strong attraction.
6. Electronegativity
- This refers to the ability of an atom to attract electrons
- This trend increases up and to the right, like ionization
7. Density
- Density increases as you move towards the middle of the table and down
As you can see there are many patterns in the periodic table, all you have to do is look.
here is a really good interactive periodic table to help with all your chemistry needs.
http://www.ptable.com/
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