Day 4 2-261. Most reactive metals =
the _______ metals.
2. Most reactive nonmetals = ________.
3. Least reactive metals = ___________.
Day 3 2-25Read / Review section 6.1 AND complete #s 1-8 on page 166
Day 4 2-26How is the periodic table arranged?
Metals
Excellent conductors (Sea of electrons) even as solids
Mobile electrons
Metals are malleable and ductile
Can be pounded into sheet
Can be pulled into wire
Periodic TrendsAtomic 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 electrons do NOT necessarily have a larger atomic radius
1. Atoms get larger going down a group.
2. Atoms get smaller going across a period
So why?...
Periodic Trends- Atoms with more electrons do NOT necessarily have a larger atomic radius
As you move down a group you increase the number of energy levels in the atom and so the atom gets larger as expected.
Periodic Trends- Atoms with more electrons do NOT necessarily have a larger atomic radius
As you move across a period, # of protons increases and outermost energy level stays the same, the attractive force between elecs. and pros. pulls the atom tighter (closer to nucleus)
Periodic TrendsWhat’s bigger:
B or Al
B or N
N or Zn
C or Cl
Read / review Section 6.2 and
complete #s 11-17 on page 173
Day 5 2-271. Why does the size of an atom
decrease moving across a period?
2. What is more reactive Cl or Ar – Explain!!!
Red = ?Green = ?
Blue = ?
Good Conductors = ?
Inert elements = ?
Review1. 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.
Partner Review1. What element is in Group 17,
Period 3?
2. What family of elements is the element above in?
3. How many valence electrons does it have?
Periodic TrendsWhat are ions?
- 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
Notes page 4
Periodic TrendsWhat are ions?
- If an atom loses elecs. it becomes smaller
- If an atom gains elecs. it becomes larger
PAGE 176-179Which elements gain elecs.? Which elements lose elecs.? Pattern?
Periodic TrendsElements on the right side of the periodic table form _________ ions
Elements in the same group form ___________ ions
negative
The same
Periodic TrendsWhat’s bigger:
F or F-
Na or Na+
Na or Rb
Na of Al
F or Cl-
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