Atomic Theory
Atomic Structure
Bohr Models
Vocabulary
Atomic Mass/Mass Number
300
What did John Dalton theorize about atoms of the SAME element?
They are the SAME
300
Which of the subatomic particles is the smallest?
The Electron
300
What are the electrons in the outermost orbital called?
Valence Electrons
300
Explain what an isotope is
An atom with the same number of protons but different number of neutrons compared to other atoms of the same element
300
What is the mass number of the atom shown in isotope notation below?
22
300
Who proposed the very FIRST atomic theory?
Democritus
300
Name the three subatomic particles that make up all atoms
Protons, Neutrons, Electrons
300
Can an orbital in a Bohr model hold less than the maximum amount of electrons allowed?
YES, but not more than the max amount
300
What two things does Atomic Number tell us about an atom?
The type of atom (element) and the number of protons
300
What is the atomic number of Tungsten?
74
400
Explain the nickname for J.J. Thomson's Model of the Atom
Plum Pudding Model - Positive pudding with negative plums floating around - DISCOVERED THE ELECTRON DJ
400
Where are all three subatomic particles located?
Protons - Nucleus
Neutrons - Nucleus
Electrons - Orbitals outside the Nucleus
400
What element does this Bohr Model represent?
Silicon
400
What is an orbital?
A region where there is a high probability of finding electrons
400
How many neutrons does the following isotope have?
10
400
How did Rutherford find the nucleus of the atom?
The Gold Foil Experiment
400
What two things do protons and neutrons have in common?
They are very close to the same size and are both inside the Nucleus
400
Which electron has more energy, the electrons that are closer to the nucleus, or the electrons that are further from the nucleus?
The electrons furthest from the nucleus have the most energy DJ
400
Explain what the Atomic Mass number tells us
The weighted average of the masses of all naturally occurring isotopes of an element
400
How many electrons does an atom of Mg+ have?
11 DJ
500
According to Bohr, how do electrons travel?
As WAVES - they do NOT move in predictable circles
500
How many electrons can fit in each of the first FOUR orbitals?
1st orbital - 2 electrons
2nd orbital - 8 electrons
3rd orbital - 8 electrons
4th orbital - 18 electrons
500
On your whiteboard, draw the Bohr Model for Boron
500
Explain the difference between a cation and an anion
Cation - positively charged atom/molecule that has LOST an electron
Anion - negatively charged atom/molecule that has GAINED an electron
500
How many protons are in an atom of Silver 2+?
47