Elements Not But Elements An element is a

Elements Not… But…

Elements An element is a _____ pure substance that cannot be separated or broken down into simpler substances by ____ physical or _____ chemical means. Examples of elements are: hydrogen oxygen iron silver sulfur silicon

If something is a _____ pure substance, it only contains one type of particle. atoms • These particles are called ______.

Elements properties that allow Each element has a unique set of ____, you to identify it. characteristic • These properties are called ______ properties _____. • Density • Melting point and Boiling point • Freezing point • Reactivity with acids Elements are classified by their properties. There are three major elemental groups: • Metals • Nonmetals • Metalloids

There are 3 major categories of elements. 1. Metals – shiny conduct heat and electric current malleable – can be flattened, rolled, or pounded into shapes

2. Nonmetals – dull – not very shiny Do not conduct heat or electric current brittle – breaks when pounded

3. Metalloids – have properties of both metals and nonmetals Some are shiny and some are dull. Some but not all conduct heat and electric current.

Major Categories of Elements Metals shiny good conductor of heat good conductor of electric current • malleable • ductile • examples: lead copper aluminum • • • Nonmetals dull (not shiny) poor conductor of heat poor conductor of electric current • brittle and unmalleable • examples: sulfur iodine neon • • • Metalloids • semimetals • have properties of both metals and nonmetals • some are shiny • some are dull • somewhat malleable • somewhat ductile • some conduct heat • some conduct electric current • examples: boron silicon antimony

The Periodic Table of Elements