Atomic Theory
Atomic theory explains_
what is the composition and behavior of matter
This number tells you how many protons are in an atom
What is the atomic number
The horizontal row on a periodic table
What is a period
A pure substance made of only one type of atom
What is an element
This subatomic particle is drawn in the nucleus of a Bohr diagram with a positive charge.
What is a proton
The Greek philosopher that first suggested that matter is made of tiny particles called atoms
Who is Democritus
The sum of protons + neutrons
What is the atomic mass
What is the vertical row on a periodic table
What is a group(Family)
A pure substance made of two or more elements chemically combined
What is a compound
These are drawn in circles around the nucleus of a Bohr diagram
What is an electron
This scientist proposed the first modern atomic theory
Who is John Dalton
What is the nucleus
Elements in the same group often have_
What are chemical properties
Water is an example of_
What is a compound
The first energy level of a Bohr diagram can hold a maximum of this many electrons
what is 2
This model introduced electrons moving in fixed energy levels around the nucleus
What is the Bohr model
Atoms of the same element with different numbers of neutrons
What is an isotope
These elements are located on the left side of the periodic table and are very reactive metals
What are alkali metals
Oxygen is an example of_
What is an element
In a Bohr diagram, electrons occupy these fixed paths around the nucleus
What are energy levels (shells)
This experiment led to the discovery of the nucleus
What is the gold foil experiment
The region around the nucleus where electrons are most likely to be found
What is the electron cloud
These elements are located between metals an non metals and often have properties of both
What are metalloids
What is made when you chemically combine sodium(Na) and Chlorine(Cl)
What is NaCl (Salt)
The second energy level of a Bohr diagram can hold a maximum of this many electrons
What is 8