Elements and symbols
Ca
Calcium
The number of protons in an atom of Manganese
25
The charge of this subatomic particle is positive.
proton
The horizontal rows of elements
periods
His model was nothing more than a simple sphere-
Dalton
Nitrogen
N
The number of neutrons in an atom of Phosphorus
16
The charge of this subatomic particle is negative
electron
The total amount of protons and neutrons added together
mass number
This is the model that is used as a visual image of the atom
Bohr
Ra
Radium
The average atomic mass of Calcium
40.08
The 2 particles are found in the nucleus of the atom
protons and neutrons
The electrons on the outermost energy level
valence
His model was the first to include electrons moving around the outside on the nucleus
Rutherford
Mercury
Hg
The number of neutrons that Iodine has
74
Where can the electrons in an atom be found?
electron cloud
A heavier or lighter version of an atom
isotope
His model was known as the plum pudding model
Thomson
Ga
Gallium
This element has 4 valence electrons on the 6 energy level
Lead
Protons and neutrons can be broken down into these smaller particles
quarks
The second to most reactive group of elements on the periodic table
Alkaline Earth Metals
This is the name of the currently accepted model of the atom
Electron Cloud model or Quantum Mechanical Model