Chemistry– 4/28/2019 Objectives Bell Ringer – Review

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Chemistry– 4/28/2019 Objectives Bell Ringer – Review 3.3 Use the periodic table to determine the atomic number; atomic mass; mass number; and number of protons, electrons, and neutrons in isotopes of elements 3.4 Compare characteristics of isotopes of the same element Calculate the weighted average atomic mass of an element from isotopic abundance, given the atomic mass of each contributor Bell Ringer – Review List the three subatomic particles and where their found in the atom. Homework: Complete atomic number and mass worksheet Study for subatomic particles quiz Read chapter 4 and complete study guide

Atomic Structure Nucleus – the center of an atom; made up of protons and neutrons Proton – A positively charged subatomic particle in the nucleus of an atom Neutron – A neutral subatomic particle in the nucleus of an atom Electron – a tiny negatively charged subatomic particle moving around outside the nucleus of an atom

Properties of Subatomic Particles Symbol Electrical Charge Relative Mass Location Electron e- 1- 1/1840 Orbiting the nucleus Proton p+ 1+ 1 In nucleus Neutron n0 Quiz on this information TOMORROW

Practice Problems Subatomic Particles Select the term that best matches the phrase Symbolized by e- Contains all the atom’s mass Has a charge of 1- Has no charge Has a positive charge and a relative mass of 1 The center of an atom Symbolized by n0 Cathode Ray Electron Nucleus Neutron Proton Electron Proton Neutron Nucleus

Atomic Structure Atomic number – the number of protons in a nucleus of an atom of that element Atomic (average) mass number – the number of protons plus the number of neutrons

Determining the number of subatomic particles Atomic Mass Atomic number # of protons (p+) = atomic # # of electrons (e-) (in a neutral atom) = # of p+ # of neutrons (n0 ) = atomic mass (rounded) – atomic # #p+ = 4 #e- = 4 #no = 9-4 = 5 9 Be 4

Atomic Structure Isotopes – Atoms with the same number of protons but different number of neutrons. Carbon-12 Carbon-14 #p+ = 6 #p+ = 6 #e- = 6 #e- = 6 #no = 12-6 = 6 #no = 14-6 = 8 Atomic Mass 12 C 14 6

Determine the #p+, #e-, and #no Atomic Atomic Element Symbol # Mass #p+ #e- #no Lithium Fluorine Argon Potassium-40 Hydrogen He n/a Ruthenium Os-194 n/a