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Matter. The Stuff of Everything… …even water and life. What is matter?. Three Properties of Matter : has mass takes up space shows inertia ( force needed to change motion ). What is matter?. Four states of matter: Solid Liquid Gas Plasma. Can matter change?.
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Matter The Stuff of Everything… …even water and life
What is matter? • Three Properties of Matter: • has mass • takes up space • shows inertia(force needed to changemotion)
What is matter? • Four statesof matter: • Solid • Liquid • Gas • Plasma
Can matter change? • Matter can changein two ways: • Physical– a change in the appearanceor stateof matter • Chemical– a change in the chemicalmake-up of matter
What is matter made of? • Composition of matter: • Elements • Compounds • Mixtures
What is an element? • An element is a basicsubstance of matter and cannot be broken down by chemical means. • There are about 90naturally occurring elements. 117 have been discovered.
What is an element? • Elements are represented by chemical symbols (letters) shown in the PeriodicTableoftheElements.
What is an element? • The smallestunit of an element is an atom. • Atoms are the buildingblocks of matter.
What is an atom? Atom Electron Proton Nucleus Neutron
What is an atom? • Atoms have 3 subatomic particles:
What is an atom? • Electrons orbit atoms in levels called shells. • Atoms like to have their shells filled.
What is an atom? • K or 1stShell – closest to the nucleus holding up to 2 electrons • L or 2ndShell – can hold up to a maximum of 8 electrons • M or 3rdshell – can hold up to a maximum of 18 electrons
What is an atom? • The number of protons (atomicnumber) in an atom will determine its elemental properties. • The periodic table of the elements shows known elements bytheiratomic number.
What is an atom? • In atoms, the number of protons equals the number of electrons giving the atom an overall neutral charge. • The number of protons plus neutrons in an atom is the atomicmass number.
Using The Periodic Table Atomic Number Element Symbol Element Name Atomic Mass