2 What is an Atom?The atom is the smallest particle of an element that retains the chemical properties of that elementAtoms are the basic building blocks of ordinary matter.Atoms can join together to form molecules (which it turn form most of the objects around you.
3 What makes up an atom? Atoms are composed of particles called: Protons ElectronsNeutronsProtons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all.
4 Where are protons, electrons and neutrons? The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus.A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons
5 Parts of the Atom Protons= Positive Charge Neutrons = No Charge Electrons=Negative ChargeNucleus= both protons and neutrons with a positive charge
6 Is there anything smaller than an atom? YesIt is called a quark.
7 The Nucleus Nucleus= protons + neutrons The nucleus only occupies a fraction of the atomIt contains almost all the mass anatom has
9 Check out this Periodic table Interactive Periodic Table
10 Periodic TableElements are organized by increasing atomic number (in other words, increase the number of protons in the nucleus)Periodic table is organized by:GroupsPeriods
11 Periodic Table Groups: Vertical Columns Organized by similar propertiesHave same number of electrons in outer energy levelsEach level can have a maximum number of electronsEach row ends when an other energy level is filledPeriods:Horizontal rowsOrganized by increasing number of protons and neutronsClassified as metals, nonmetals, and metalloids