Big Ideas
The Periodic Table

The statement that there is a periodic repetition of chemical and physical properties of the elements when they are arranged by increasing atomic number is called the periodic law. The periodic table is organized in periods (rows from left to right) and groups (columns from top to bottom) by increasing atomic number. According to periodic law, elements with similar chemical and physical properties are in the same group. This is because they have the same valence shell electron configuration.

Noble gasses, those in the group at the farthest right of the periodic table (He, Ne, ..). These elements have 8 valence electrons and are extremely stable. The octet rule suggests that to acquire the stable electron configuration, atoms can gain, lose, or share electrons to achieve a noble gas-like configuration.

Elements can be classified as metals, non-metals, or metalloids. Trends exist in atomic radii, ionic radii, ionization energy, and electronegativity. The ionization energy measures how strongly an atom will "hold" on to its electrons. Electronegativity, which can determine the type of bond formation, is the ability of an element to attract electrons in a chemical bond.


Experiences
Patterns
Explanations

 

 

Building atoms with bingo chips


 

 

 

Periodic table activity
Element Cards

The number of protons goes up with every element

Neutrally charged atoms have equal numbers of protons and electrons

Atomic number and mass go up as you go to the right and down on the periodic table

 

 

Electronegativity increases as you go to the right across the periodic table

Elements with similar reactivity are arranged in similar groups

Elements with the same number of valence electrons have similar reactivates

Density does not have a pattern

 

The periodic table is arranged by atomic number

 

 

 

 

 

The periodic table has trends.

An elements reactivity is related to the number of electrons it has in its outer most shell

Elements with the same number of valance electrons are put in the same groups

The properties of an atom are closely related to the arrangement of electrons around the nucleus of the atom.

Objectives
  1. Explain why elements in a group have similar properties.
  2. Predict the properties of an element based on its location in the Periodic Table.
  3. Predict the location of an element in the Periodic Table based on its properties.