Structure of Matter Matter 3 states of Matter

Structure of Matter

Matter 3 states of Matter Solid Liquid Gas

Matter All matter is composed of ELEMENTS. All Elements are composed of ATOMS.

Composition of an Atom An atom is made of 3 subatomic particles. . . Protons – positive charge (1 amu) Neutrons – neutral or no charge (1 amu) Electrons – negative charge (0 amu)

Composition of an Atom All atoms have an atomic mass Atomic Mass consists of the protons and neutrons Since the mass of an electron is so small, it is NOT counted as a part of the atomic mass. . . only protons and neutrons count

Composition of an Atom All atoms have an atomic number The atomic number tells you the number of PROTONS and ELECTRONS in a neutral atom.

Structure of an Atom Nucleus is the center of the atom Inside the nucleus are the protons and neutrons The Electron Cloud surrounds the nucleus + + + + Electrons are found on the energy levels that make the electron cloud 2– 8– 8 Bohr Model

Atoms All atoms are neutral which means. . . All atoms have an equal number of protons and electrons.

Where do you find atomic structure information? On the PERIODIC TABLE Atomic # Element Symbol (First letter is ALWAYS capitalized. If it has two letters, the first letter is capitalized and the second letter is ALWAYS lower case. ) Element Name Atomic Mass 5 B Boron 10. 81

Using the Periodic Table 5 B Boron 10. 81 Protons = 5 because atomic # is 5 Electrons = 5 because atomic # is 5 Neutrons = 6 because atomic mass is 11 and atomic # is 5, SUBTRACT: 11 – 5 = 6