Atom Models
Dalton's model
What is the solid sphere model?
JJ Thomson's experiment that led to the discovery of negatively charged electrons
What is the Cathode Ray Tube Experiment
This indicates how many protons an element has and determines the identity of an atom
What is the atomic number?
Columns of the periodic table that group elements based on the number of electrons they have in their valence shell
What is a group?
How many moles are in 14.01 g of N
1.000
Atomic model most helpful for showing energy levels and how atoms bond.
What is the Bohr Model
Rutherford's experiment that demonstrated that the atom contains a solid, positively charged, nucleus
What is the Gold Foil Experiment
These charged particles make up most of an atom's volume, are found moving in an atom's energy levels, and are involved in chemical bonding
What are electrons
rows of a periodic table which group atoms based on how many energy levels/electron shells they have
What is a period?
What is the average atomic mass of D?
91D atomic mass is 90.9936 amu and its abundance is 91.05%
93D atomic mass is 92.9859 and its abundance is 8.95%
91.1719 amu
JJ Thomson's depiction of the atom with positively charged goo with electrons interspersed.
Modified Rutherford's Nuclear Model by introducing the idea that electrons orbit the nucleus in specific energy levels.
Who is Niels Bohr
These contribute to an atom's mass and stability and the number may vary between different isotopes
What is a neutron?
Reactive elements found on the righthand side of the periodic table
What are halogens
How many grams are in 2.30 moles of gold
453 grams
Most current atomic model thanks to Chadwick's discovery in the 1930s.
coined the term "atomos" which means indivisible
Who is Democritus
These includes all the particles found in the nucleus. They have a strong nuclear attraction which overcomes the repellent force made by the positive charges from protons.
What are quarks?
Rank the following elements from most reactive to least reactive: Fr Ar Na K
Fr K NA Ar
How many atoms are in 6.2 g of Na
1.6 × 10²³
This scientist had two major contributions to the atomic model: First he discovered that the atom has a nucleus (Nuclear model), and he later discovered the proton.
Who is Ernest Rutherford
Experiment that determine the total charge of an electron
What is the Millikan Oil Drop Experiment?
These particles contribute to an atom's mass
What are protons and neutrons
Reactive elements found on the lefthand side of the periodic table
What are alkali metals?
How many grams are in 7.0 x 107 atoms of O
1.9 x 10-15 g