1. Periodic Table
Chemistry 2013

2. Groups Notes Groups are “up and down”
Elements in the same group have similar chemical properties and bonding characteristics
Practice
List 3 elements that have similar bonding characteristics to chlorine.

3. Valence Electrons Notes
Valence electrons are the electrons in the outer energy level of an atom
Roman Numerals at top of each group tell you how many valence electrons and element has (I=1, V=5)
Practice
An unknown element has 6 valence electrons. Which group is it in?

4. Ions
Notes
When an atom gains or loses electrons it becomes an “ion” (a charged atom)
Metals donate/lose electrons
Nonmetals gain electrons
Atoms bond or form compounds so that their charges equal 0
Practice
Name 2 elements that sodium is most likely to bond with.

5. Names Notes Metals are on the left side of the staircase
Nonmetals are on the right side of the staircase
Metalloids touch the staircase
Transition metals are groups 3-12
Practice
Name 2 metals, 2 nonmetals and 2 metalloids

6. Names (part II) Notes Group 1 are the alkali metals
Group 2 are the alkaline earth metals
Group 17 are the halogens or halides
Halogens most readily accept electrons
Practice
According to the periodic table, which element most readily accepts electrons?
A Bromine B Nitrogen
C Potassium D Aluminum

7. Noble Gases Notes Noble gases are the elements in group 18
They have full outer energy shells so they are resistant to forming compounds
Noble gases do not form ions or bond with other elements
Practice
Which elements on the periodic table are most resistant to forming compounds?

8. Atomic Number
Notes
The atomic number (above element symbol) is the number of protons
Use “number of protons” to identify an element
Ex. Silicon has atomic number of 14, so it has 14 protons
Practice
A certain atom has a nucleus containing 31 protons and 33 neutrons and has 30 electrons orbiting the nucleus. This ion is a form of the element __________________.

9. Atomic Number
Notes
The atomic number (above element symbol) is the number of protons
Use “number of protons” to identify an element
Ex. Silicon has atomic number of 14, so it has 14 protons
Practice
A certain atom has a nucleus containing 31 protons and 33 neutrons and has 30 electrons orbiting the nucleus. This ion is a form of the element __________________.