More Periodic Table Trends printable pdf download

More Periodic Table Trends

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More Periodic Table Trends

Many properties of the elements change in a predictable way as you move through the periodic table. We

have already examined one such property: periodic trends in reactivity. We will now Predict, Observe

and Explain several other periodic trends…

Atomic Radius

atomic radius: distance between the center of the nucleus of an atom and the

outermost electrons

Thought POE: How does atomic radius vary within groups (going down the periodic table) and within

periods (going across the periodic table)?

Trend Down

There are more electrons as you go down so they

a Group

increases

will fill up more shells which will make the

atomic radius bigger

Trend Across

The more protons there is, the stronger the

a Period

nuclear force; so the more protons there are, the

decreases

more they can pull the electrons closer towards

the nucleus

Ionic Size

ion: an atom that has a positive or negative charge because it has lost or gained electrons

Thought POE: How does the size of an atom change when it becomes an ion?

Electrons are

The proton charge is greater, so they are better

Removed

decreases

able to pull the electrons closer to themselves

Electrons are

The electrons outnumber the protons, so the

Added

increases

protons have a less effective nuclear force which

make it harder to pull the electrons closer

More Periodic Table Trends