1 THE ATOM. NUCLEAR MODEL OF THE ATOM An atom is an electrically neutral particle Composed of protons, neutrons, and electrons. Atoms are spherical in.
atoms and molecules
Implementation of DOE N 234.1 Reporting of Radioactive Sealed Sources Len Myers Protection Strategies, Inc.
Ch. 4 - Atomic Structure I. Structure of the Atom Dalton’s Atomic Theory Subatomic Particles.
1 Chapter 2: Atoms and Molecules. 2 SYMBOLS AND FORMULAS A unique symbol is used to represent each element. Formulas are used to represent compounds.
Atoms of the same element with different numbers of neutrons. What has changed if there is a different number of neutrons. HINT: look at your periodic.
Ions and Isotopes
Chapter 7: Radiation. Remember from Chemistry: Mass numberMass number: the number of protons + number of neutrons Atomic numberAtomic number: the number.
Unit 2 Review - Section 1 Atomic Structure and Mass.
Chapter 18 Lesson 2 Masses of Atoms. The nucleus contains most of the mass of the atom because protons and neutrons are far more massive than electrons.
Implementation of DOE N 234.1 Reporting of Radioactive Sealed Sources
Ions and Isotopes. Warm Up 1.What’s the difference between a unicycle, a bicycle and a tricycle? (aren’t they the same thing?) 2.How many protons, neutrons,