Atoms and Isotopes

The Atom An atom is the smallest part of the element that still retains the properties of the atom. A crumb of the cake An element is matter made up of only one type of element.

Atomic Structure Protons Neutrons Electrons Positive, inside the nucleus, same size as a neutron p+ Neutrons Neutral, inside the nucleus, same size as a proton no Electrons Negative, outside the nucleus, much smaller e- Proton, neutron, electron

Mass and Atomic Numbers Atomic number = number of protons (#p+) Mass number = number of protons + number of neutrons (#p+ + #no) In a neutral atom # positives = # negatives #p+ = #e- Practice How many protons, neutrons, and electrons are in an atom of carbon-12? (what does the 12 represent here?) Mass number and atomic number

Isotopes Isotopes are atoms of the same element that have different mass numbers. For example chlorine-35 and chlorine-37. How many protons does Cl-35 have? Cl-37? How many electrons do each have? How many neutrons do each have? What is the difference between the isotopes? isotopes

Compare and Contrast Iron - 55 Iron - 56 practice

Comparison Matrix Characteristics Charge Size Location proton items to be compared   Charge Size Location proton similarities differences electron neutron

Independent Practice Finish Comparison Matrix Atoms and Their IsotopesWorksheet