Transcript 2 periodic table pd9

Day 5
Use your colored periodic table:
2-25
1. Where are the alkaline earth
metals on the periodic table?
2.
noble gas
Neon is a __________.
3.
The elements in the middle of the
periodic table (or the d-block) are
transition metals
called the _________________.
Halogens
Similar properties:
Group # 17
Very reactive
Fluorine and Chlorine = gases
7 valence electrons
Transition metals
Similar properties:
Generally least reactive metals
Tricky valence (can change
from the expected)
Mostly form +1, +2, and +3
ions
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
Page 168-169
Should
already be
colored =
Assignment (DUE TODAY) =
Read section 6.1 (pages 160-166) and
complete #s 1-7 on page 166.
Day 6 2-26
1. Most reactive metals =
the _______ metals.
2. Least reactive metals =
_________.
3. Most reactive nonmetals =
________.
How is the periodic
table arranged?
Periodic Trends
Atomic radius:
- Measure of size – radius of an
atom
- Atoms with more electrons do
NOT necessarily have a larger
atomic radius
Periodic Trends
- Atoms with more electrons do NOT
necessarily have a larger atomic
radius
Periodic Trends
- Atoms with more
1. Atoms get larger
electrons do NOT
going down a
necessarily have a
group.
larger atomic radius
2. Atoms get
smaller going
across a period
So why?...
Periodic Trends
- Atoms with more
As you move down
electrons do NOT
a group you
necessarily have a
larger atomic radius increase the
number of energy
levels in the atom
and so the atom
gets larger as
expected.
Periodic Trends
- Atoms with more As you move across
a period, # of
electrons do NOT
protons increases
necessarily have a
larger atomic radius and outermost
energy level stays
the same, the
attractive force
between elecs. and
pros. pulls the atom
tighter (closer to
nucleus)
Periodic Trends
What’s bigger:
B or Al
B or N
N or Zn
C or Cl
Review
1. What element is in Group 2,
Period 3?
2. Name an element in Group 3
3. How many valence electrons
in Xe?
4. Give me an element with 1
valence electron.
1.
Elements with the same Day 1 2-27
# of valence are in the same
_______ on the periodic table.
a. alkali metals = __ valence
b. alkaline earth metals = __ valence
c. halogens = __ valence
d. noble gases = __ valence
We are taking an ATB quiz on today’s ATBs in 5 minutes.
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-
Read / review
Section 6.2 and
complete #s 11-17
on page 173
Day 2 3-2
1. Which halogen is found in period 2?
2. How many valence electrons does
calcium have?
3. Why does the size of an atom
increase moving down a group?
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
As of today, you should have the
following:
Families colored in (page 168)
Valence electrons marked
+1, +2, -1,-2, and -3 ions marked
Day 2 3-2
Ions =
Valence
electrons =
+1
1
8
+2
2
3
-3 -2 -1
4 5 6 7
Add today:
Reactivity trend (front / back)
Atomic size (front / back)
Positive and negative ion trend on back
Day 2 3-2
Ions =
Valence
electrons =
Atom size decreases
+1
1
8
Atom size increases
+2
2
3
Reactivity increases away
from the middle
-3 -2 -1
4 5 6 7
Positive and Negative ion trend
Elements on the right side form
negative ions.
Elements on the left form positive
ions.