Periodic Table

• Elements are pure chemicals
• Compounds are made up of two or more elements joined together
• Mendeleev designed The Periodic Table
• Groups are vertical columns; elements in the same group have similar properties
• Periods are horizontal rows; elements across a row have different properties
• Non-metal oxides are acidic when added to water
• Metal oxides are alkaline when added to water
• Mass of reactants = mass of products
• A physical change is a change that is reversible
• A chemical change is a change that is irreversible (new substance)
• Examples of physical properties are appearance, colour, texture, density, hardness, and melting point.
• Examples of chemical properties are reactivity with water and oxygen, solubility, boiling point, and melting point.
• Malleable means it can be hammered into different shapes
• Examples of properties in most metals are malleable, ductile, good conductors of heat and electricity and sonorous
• Ductile means it can be stretched into wires
• When an element reacts with oxygen, an oxide compound is formed