Vocab 1
Smallest unit if matter that makes up an element and retains that element's properties.
Atom
John Dalton (year and summary of model)
What is 1803, proposed that all matter is made of tiny particles called atoms (solid sphere model).
Average Atomic Mass
The weighted average of the masses of all naturally occurring isotopes of an element.
H, 1,1,_,0,1
1
Write both the hyphen form and the nuclear form for a common isotope
Carbon-12, 12C
A positively charged subatomic particle found in the nucleus of an atom
Proton
Discovered the electron and proposed the plum pudding model. (year)
What is 1897 – J.J. Thomson
Atomic Number
The number of protons in an atom.
B,5,_,5,6,_
11,5
Summary of the structure of atom
What is an atom has a dense nucleus made of protons and neutrons, (with electrons moving around the nucleus in energy levels or an electron cloud).
Neutron
A subatomic particle with no charge found in the nucleus of an atom
1911 – Ernest Rutherford
What is discovered the nucleus using the gold foil experiment, atom is mostly empty space.
Mass Number
The total number of protons and neutrons in an atom.
Na, 11,23,11,_,11
12
Explain the different charges of each subatomic particle
What is Protons have a positive charge, neutrons have no charge, and electrons have a negative charge.Protons have a positive charge, neutrons have no charge, and electrons have a negative charge.
Electron
A negatively charged subatomic particle found outside the nucleus in energy levels or the electron cloud.
Proposed that electrons move in specific energy levels around the nucleus (Bohr model). 1913
What is Niels Bohr
Isotope
Atoms of the same element that have the same number of protons but different numbers of neutrons.
Carbon -12,6,_,6,6,6
12
Differentiate between the Bohr Model and the Electron Cloud Model
What is Bohr Model shows electrons traveling in circular paths around the nucleus. but the Electron Cloud Model shows electrons moving in regions, where their exact location cannot be known.
Quarks
Tiny particles that make up protons and neutrons.
Electron Cloud Model (year and summary if model)
What is 1926, Electrons move in regions of probability, not fixed paths.
Valence Electrons
Electrons in the outermost energy level of an atom.
7Li,_,7,_,4,_
3,3,3
Label the parts of oxygen.
Atomic number, 8
Element symbol, O
Element, Oxygen
Mass Number, 12.01