ATOMS AND THE PERIODIC TABLE chapter three. FOCUS ACTIVITY 1. ATOMIC THEORY - history. NUCLEUS. PROTON +. NEUTRON (NEUTRAL). ATOMIC THEORY - STRUCTURE MODEL OF THE ATOM. ELECTRON -. ENERGY LEVELS. ATOMIC STRUCTURE ELECTRON LOCATION. Electrons are found in energy levels of an atom.
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Electrons are found in energy levels of an atom.
Electrons occupy the lowest energy level available.
Bohr’s Atom and Energy Levels
(Like a sphere)
may contain up to 2 electrons
first energy level is an s orbital
They determine the chemical properties of an element.
Los Alamos National Laboratory: Periodic Table
Periodic Table of the ElementsTraditional Periodic Table
(and ELECTRONS too)
PROTONS AND NEUTRONS HAVE EQUAL MASS. ELECTRONS ARE TINY – 1800 EQUAL ONE PROTON.
ATOMIC NUMBER 17
protons _?_ electrons _?_
The atoms of an element always have the same number of protons.BUT…..The atoms of an element may have different numbers of neutrons.This is an ISOTOPE!
Two carbon ISOTOPES:
CARBON 12 = 6 protons and 6 neutrons
CARBON 14 = 6 protons and 8 neutrons