What is a genetic mutation? JUST DO IT 3.18.13 Daily Riddle   In Question What is a genetic mutation?

Today in your notebooks Left side items Right side items States of matter BP States of matter notes Solid, liquid, gas HW Bill Nye phases of matter Phase changes graph Molecular kinetic energy notes Atom diagram, brainpop Atoms notes Element box calculations Element box notes P, N, E practice HW Periodic table PT groups/famillies, PT brainpop PT notes Atomic trends Atomic trends notes Compounds and molecules, BP Bonding notes Atomic arrangements Arrangements notes Valence electrons ws Valence electrons notes

Valence electrons 3.18.13 Valence electron – the outer ring of electrons. These are the bonding electrons. Stable octet: an atom is stable when it has 8 electrons in its outside shell. *** true for atoms with low atomic numbers Review Ionization energy: energy needed to pull an electron, low energy when the nucleus is far awar Atomic size: atoms decrease in size as you move across a period (protons are bigger than electrons and pull them in) and increase as you go down a group (adding electron shells)

DETAILS H Cl Cl Cl Cl H C H H Cl H H H H H H N H H H H H H H N H H

Common Ions Ions- Group 1 + Group 17 Group 2 + Group 16

Common compounds Compounds Methane = CH4 Ammonium = NH3 Water = H2O

Group 1 Group 2 Group 13 Group 15 Group 16 Group 17 1 valence LOSE 1 +1 charge 2 valence LOSE 2 +2 charge 3 valence LOSE 3 +3 charge 5 valence GAIN 3 -3 charge 6 valence GAIN 2 -2 charge 7 valence GAIN 1 -1 charge

Exit slip How many electrons can the first shell hold? A. 1 B. 2 C. 3 D. 4 2. What is a valence electron? Outside electrons B. First electron C. They bond with protons D. They are special and live in the nucleus 3. How many electrons can the second shell hold? A. 2 B. 8 C. 18 D. 32 4. What does the atomic number represent? # of protons B. # of neutrons C. # of protons and neutrons D. # of protons minus electrons 5. What does the atomic mass represent? A. # of protons B. # of neutrons C. # of protons and neutrons D. # of protons minus electrons