PART 4PERIODIC TRENDS:

IONIZATION ENERGYor…

BREAKING THE SPRING!!!

• Ionization energy is defined as the energy required to

• Think of ionization energy as a

measure of how ____________ an atom’s nucleus holds onto its electrons.

A low ionization energy indicates that

the atom has a ____________ hold on its electrons – and vice versa.

Ionization Energy (cont.)

Does the group trend for ionization energy make sense?

Does the period trend for ionization energy make sense?

PART 5

WHAT ALL THINGS WANT

Back to the question: why are alkali metals so

reactive?Consider: what do all thing in the physical universe want?

How can atoms get there?

The Noble Gases have

______________

________________

for any element in their period.

Therefore: all other elements are noble gas “Wannabee’s!”

OCTET RULEAtoms tend to gain, lose, or share electrons to acquire a full set of _______ valence electrons.________ IS GREAT!(except those close to helium, like _____________ & _____________ who only want ______ electrons)

PART 6 - REACTIVITY OF METALSCan you explain the cartoon below?

• Do metals have high or low ionization energies?

Will it be easier for metals to gain or lose electrons to attain a noble gas

configuration?

NOTES ON LAST SLIDE

METALS REACT BY

______________ELECTRONS!!The lower the ionization

energy, the __________ it is for a metal to lose electron(s), and

the ______________ reactive the metal is!

SO – WHY ARE ALKALI METALS THE MOST REACTIVE METALS ON THE

PERIODIC TABLE?

Alkali metals are so reactive because: