Presentation on theme: "Structure of the Atom or Lets Get up and Atom Chemical Symbols Nucleus/ clouds Subatomic Particles Atomic Terms."— Presentation transcript:
Structure of the Atom or Lets Get up and Atom Chemical Symbols Nucleus/ clouds Subatomic Particles Atomic Terms
Chemical Symbols Capitals matter! Element symbols contain ONE capital letter followed by lowercase letter(s) if necessary. Co vs. CO Metal that forms bright blue solid compounds. Poisonous gas.
Subatomic Particles Most of the atoms mass. Atomic Number equals the # of... in a neutral atom NUCLEUS ELECTRONS PROTONS NEUTRONS NEGATIVE CHARGE POSITIVE CHARGE NEUTRAL CHARGE ATOM
Subatomic Particles Quarks 6 types 3 quarks = 1 proton or 1 neutron He
II. Electron Clouds (shells) Contain electrons (-) Orbital Energy Levels Bohr Model Diagrams
Orbital Region where there is 90% probability of finding an electron. Cant pinpoint the location of an electron. Density of dots represents degree of probability.
Orbitals have different shapes.
Energy Levels Electrons can only exist at certain energy levels. Low energy levels are close to the nucleus. Each energy level (n) can hold 2n 2 electrons.
Bohr Model Diagrams Simplified energy levels using Bohrs idea of circular orbits. e- Maximum e - Level 12e - Level 28e - Level 318e - Level 432e - Lithium Atomic #:3 Mass: 7 # of p:3 # of e:3 # of n:4 p p n n n n p e- Can replace with: 3p 4n
Bohr Model Activity Choose a number between 1 & 18. Find your element by the atomic number you picked. Draw a Bohr Model diagram for your element on your marker board. Round off the mass listed on the table and subtract the atomic # to find the # of neutrons. Abbreviate the # of p and n in the nucleus. Have a partner check your drawing. Repeat with a new element.
Atomic terms Atomic Number (Z) Mass Number (A) Atomic Mass unit (amu) Isotopes
Atomic Number (Z): Number of Protons In a neutral atom the # of protons = number of electrons P+ = e- 14+ = 14-