Periodic Table Trends: Atomic Radius & Ionization

Energypg. 307-312

LO: I can describe and explain the trend of atomic radius & ionization energy.

Element Families (Groups)

1: Alkali Metals2: Alkaline Earth Metals3: Boron Group4: Carbon Group5: Nitrogen Family6: Oxygen Family7: Halogens8: Noble Gases

Element Families (Groups)

Family number = # of valence electrons (v.e.)

1. Helps determine chemical behavior

2. Elements in same family behave similarly, chemically.

Homework Due: Inquiry into the PT

Atomic Radius

Atomic radius decreases as you move left to right across a period.

Atomic radius increases as you move down a family.

Atomic Radius

Atomic RadiusWhy the trend?

As you move left to right across a period...Nuclear Charge:

Valence Shell:

Result:

Atomic RadiusWhy the trend?As you move top to bottom down a family...Nuclear Charge:

Valence Shell:

Result:

Atomic Radius of Ions

Positive Ion RadiusNa+ vs. Na

Negative Ion RadiusCl- vs. Cl

The Noble Gases

Noble Gases: Group 8Inert (non-reactive), stable elements due to full valence electron shells.

All elements want to “be like” the noble gases (stable).

Ionization Energy

Ionization Energy: The energy needed to remove an electron from an atom.

Leads to the formation of an ion (charged particle).

Ionization Energy Trend (I.E.)

I.E. increases as you move left to right across a period.

I.E. decreases as you move down a family.

Ionization EnergyAs you move left to right across a period Nuclear Charge:

Valence shell:

Result: i.e. increases

As you move top to bottom down a family Nuclear Charge:

Valence shell:

Result: i.e. decreases

Homework

1) Read pg. 307-312 & complete questions on pg. 319-320, #73, 74, 81-84 only in your ISN.

Due Tuesday, 12/8