Name: ________________________________
Notes 3.1 – Atomic Structure
Name: ________________________________
Fill in the blanks for the elements in this chart. For the purposes of this chart, round all atomic masses to the nearest whole number.
Element
lithium
carbon
chlorine
silver
lead
calcium
tantalum
Number of
Protons
Number of
Neutrons
Number of
Electrons
Mass
Number
Atomic
Number
radium
samarium
uranium
americium
Bohr Model – In 1913 the Danish physicist Niels Bohr published a paper introducing his model of the atom. The Bohr
model resembles a miniature solar system with the concentric electron paths (ENERGY LEVELS) forming the planetary
orbits and the nucleus at the center like the sun.
You can determine how many energy levels an atom has depending on what
row it’s in on the periodic table.
For example, Potassium was placed on the 4th row because it has 4 energy
levels.