PERIODIC TABLE. The Language of Chemistry. CHEMICAL ELEMENTS - pure substances that cannot be decomposed by ordinary means to other substances. Aluminum. Bromine. Sodium. The Language of Chemistry. The elements, their names, and symbols are given on the PERIODIC TABLE.
Dmitri Mendeleev (1834 - 1907) arranged elements in order of increasing atomic mass.
Elements in groups react in similar ways!
Have similar chemical and physical properties
3 classes of elements
Cutting sodium metal
Group 2A: Alkaline Earth Metals
Lanthanides and actinides
Good conductors of electricity and heat
Iron, Cobalt and Nickel can create magnetic
Can have several oxidation (Lose Electrons) states
Forms salts (NaCl)
Forms Acids (HF)
Used in: lamps (halogen), Teflon (Flourine + Carbon)
1. Name group 1
2. Name group 7
3. 2 Characteristics of metals
4. 2 characteristics of nonmetals
Na Ca I O
A CATION forms when an atom loses one or more electrons.
An ANION forms when an atom gains one or more electrons
F + e- --> F-
Mg --> Mg2+ + 2 e-
By losing or gaining e-, atom has same number of e-’s as nearest Group 8A atom.