question of the day elements on the right side of the periodic table form _________ ions elements in...

Question of the DayElements on the right side of the periodic table form _________ ions

Elements in the same group form ___________ ions

negative

The same

Day 2 1-27

Octet rule –

notes page 6

Octet rule – Atoms tend to gain, lose, or share electrons in order to acquire a full set of valence electrons (8)

What is electronegativity?

How does it

increase on

the p. t. ?

Electronegativity – ability to attract electrons in a bond

How does it increase on the p. t. ?

In this bond: Ba—S, which way do

elecs. Shift? WHY?

S, > electroneg.

Periodic TrendsIonization energy – energy needed to remove one electron from an atom

Li → Li+ + e-

… indication of how strongly an atom holds onto its outermost elecs.

Periodic TrendsThe graph on page 178 shows how ionization energies vary with atomic #

What element does the black point at (10, 2100) represent?

With respect to the periodic table ionization energies show 2 important trends…

Periodic TrendsWith respect to the periodic table ionization energies show 2 important trends…

1. Decrease as you move down a group

2. Increase as you move left to right across a period

Periodic Trends

How does the ionization energy trend compare to the atomic radius trend?

Does this make sense?

Periodic Trends

O

Be

Be

Cl

------

What’s bigger: ↑er I. E.:

O or C

Be or Ca

Na or Be

Cl of Al

Ca or B+3

IN NOTES

Periodic Trends

O

Mg

Be

Cl

------

What’s bigger: ↑er I. E.:

O or B

Mg or Sr

K or Be

Cl of Si

Sr or Al+3

IN NOTES

Periodic TrendsSuccessive Ionization energies (removing more than one electron from an atom):

- The 2nd > 1st, the 3rd > 2nd, the 4th > the 3rd

- but if you look at the I. E. s there is usually a large jump. Where? PAGE 178

Add the following trends:

Reactivity

Size (atomic radius)

Electronegativity

Assignments

Online assignment = shssci.wikispaces.com

Read section 6.3 and complete #s 18, 19, 21, 22, 24, 25 on page 182

BOTH DUE BY THE END OF THE PERIOD!!!

Periodic TrendsHow does atomic radius change?

Why?

How does ionization energy change?

Why?

Ionization energy

Fluorine

Noble gas

Inert

Group 17

Malleable

Ductile

Alkali metals

Francium

Period 4

Electronegativity

Octet Rule

Double periods

C

B

A

Atomic mass

*** _________ ***

_______

Similar properties:

_______________

__________________ (groups)

Families