History of the Atom!
This was the name of the Greek philosopher who first proposed the idea of the atom as being the "indivisible" (atomos)
Who was Democritus?
Draw the nuclear symbol for Hydrogen, when it has 0 neutrons.
Answer.
Protons
The atom is made primarily of what two areas?
Nucleus and the electron cloud
8
This guy, inventing the electron, proposed the Plum Pudding model for the atom.
Who is J. J. Thomson?
Draw the nuclear symbol for the element that has a Mass # of 59 and has 28 protons.
Answer
Neutrons, since they have no charge, have the main purpose of giving this to the atom.
What is Mass?
This man, in early 1800s, gave us the name for the first concept of the atomic model, which he called the Billiard Ball Model
John Dalton
Niels Bohr came along in the development of the model and proposed that electrons surround the nucleus in fixed _________.
What are orbits?
Protons and Neutrons
When an atom is neutral, the atomic number is equal to what TWO subatomic particle?
Protons and Electrons
The Bohr Model, showing electrons circularly fixed surrounding the nucleus, was also known as the _______________ model.
Planetary
Draw the Bohr model for Aluminum.
Should have three energy levels, three electrons on the outermost level.
After the Plum Pudding model, Ernest Rutherford was noted for discovering this, using the gold foil experiment.
What is the nucleus?
Draw the nuclear symbol for Potassium-39.
Answer.
When any two atoms of the same element have different numbers of neutrons, they are known as...
Isotopes
Hyphen notation immediately and directly represents what two pieces of information (not involved in calculations)
Element name and mass number
(For example: Carbon-12 or Nitrogen-14).
Draw the Bohr model for a Hydrogen-2 isotope.
- one energy level, one electron on it.
- with this being an isotope of Hydrogen with a mass number of two (as indicated by the hyphen notation), then it is apparent that there should be one neutron indicated inside the nucleus)
Our current conception of the atom is known by this name.
What is the Quantum-Mechanical Model
Draw the nuclear symbol for sodium when it has 13 neutrons.
Answer
When an atom has a # of electrons that differs from its # of protons, it is known as a(n)...
Ion!
BONUS for EVERYONE!!
What was the main distinction/advancement between the Bohr Model and our current model of the atom?
(Hint: think electron).
Electrons exist in a cloud, not in neatly fixed orbits as Bohr suggested. This is due to their being both a wave and a particle.
Draw the Bohr model for Calcium.