Transcript 3 periodic table r - shssci

Day 4 1-23
1. The elements in group 17 are called the
____________.
2. They all have ____ valence elecs.
3. They are the __________ reactive
nonmetals.
Day 5 1-24
1. The elements in group 2 are called the
____________.
2. They all have ____ valence elecs.
How is the periodic
table arranged?
Day 2 1-19
Online Assignment
shssci.wikispaces.com
Metals
Excellent conductors (Sea of
electrons) even as solids
Mobile electrons
Can be pulled
into wire
Metals are malleable and ductile
Can be pounded
into sheet
Periodic Trends
Atomic radius:
- Measure of size – radius of an
atom
Periodic Trends
What are ions?
Notes
page 4
- atoms that are charged due
to the loss or gain of
electrons
- If an atom loses elecs. it becomes
smaller and positive
- If an atom gains elecs. it becomes
larger and negative
Periodic Trends
What are ions?
- If an atom loses elecs. it becomes
smaller
- If an atom gains elecs. it becomes
larger
PAGE 176-179
Which elements gain elecs.? Which
elements lose elecs.? Pattern?
Periodic Trends
Elements on the right side of
the periodic table form
negative ions
_________
Elements in the same group
The same ions
form ___________
Periodic Trends
What’s bigger:
F or
F
Na or
+
Na
Na or Rb
Na of Al
F or Cl-
Quick Draw
Group
Halogens
Reactivity
Period
Transition metals
Atomic radius
Day 6 1-25
1.Which of the following are
larger?
F OR S-2
2. Give at least 2 reasons why.
Day 6 1-25
1. Which of the following are larger?
Ca OR Sr
Cs OR Cs+1
Rb OR Ca+2
Question of the Day
1. What element is in
Group 13, Period 3?
Day 1 1-26
2. Name an element in Group 4
3. How many valence electrons
in Xe?
Octet rule – Atoms tend to gain,
lose, or share electrons in order to
acquire a full set of valence
electrons (8)
- 2 for H, He, Li, Be, + B
notes page 6
Electronegativity – ability to
attract electrons in a bond
Na—Cl
… In the compound above electrons
shift toward Cl because it is more
electronegative!
What is electronegativity?
Electronegativity – ability to attract
electrons in a bond
How does it
increase on
the p. t. ?
How does it increase on the p. t. ?
In this bond: Mg—O, which way do
elecs. Shift? WHY?
O, > electroneg.
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!!!
Ionization energy
Ductile
Fluorine
Alkali metals
Noble gas
Francium
Inert
Period 4
Group 17
Electronegativity
Malleable
Octet Rule
C
A
B
*** _________ ***
Similar properties:
Atomic mass _______________
_______
__________________
(groups)
Families