Atomic Theory Scientists
Developed the first atomic theory, which stated that atoms are the basic building blocks of matter and are indivisible.
What subatomic particle has a positive charge?
Proton
How do you find the number of protons in an element?
Atomic Number
What model uses all electrons?
Bohr Model
The time required for half of the original amount of a substance to decay (break down)
Half-Life
Discovered the electron and proposed the "plum pudding" model, where electrons are embedded in a positive mass.
JJ Thomson
What subatomic particle has a negative charge?
Electron
How do you find the number of neutrons in an element?
Atomic Mass - Protons
What do the dots on the Lewis Dot Structures represent?
Valence Electrons
What does the number next to the element name represent for an isotope?
Atomic Mass
Conducted the gold foil experiment, discovering the nucleus and proposing the nuclear model where electrons surround a dense, positive nucleus.
Ernest Rutherford
What subatomic particle has a neutral charge?
Neutron
How many protons does Hydrogen have?
1
How many valence electrons do elements in group 14 have?
4
Atoms of the same element (same number of protons) but with different numbers of neutrons, which changes their mass.
Proposed the planetary model, where electrons orbit the nucleus in specific energy levels or shells.
Niels Bohr
What particles are located in the nucleus?
Protons and Neutrons
How many neutrons does Carbon have? (Atomic Mass = 12)
6
What does the Lewis Dot Structure for Oxygen look like?
Answer on whiteboard.
How many protons, neutrons, and electrons does the isotope Carbon-14 have?
6 protons, 8 neutrons, 6 electrons
Determined that electron paths cannot be predicted and exist inside the Electron Cloud.
Schrodinger & Heisenberg
Where are electrons located?
Orbitals / Electron Cloud
For an atom with atomic number 11 and mass number 23, how many Protons, Neutrons, and Electrons would you have?
11 Protons, 12 Neutrons, 11 Electrons
What does the Bohr Model for Silicon look like? (Atomic Number = 14)
Answer on whiteboard.
A bone was recently recovered from a site in eastern Africa. Radiocarbon dating suggests that the bone contains 12.5% of the original amount of Carbon-14. How old is the bone? (Half-Life of C-14 is 5730 years)
17,190 years old