What is an Atom?
Models of the Atom
The Periodic Table
Atoms to Ions
Structures of Atoms
100
The center of the atom.
What is a nucleus
100
In the fourth century he proposed the idea that matter was made of particles that could not be split.
Who is Democritus?
100
Elements are arranged according to proton number.
How are elements arranged on the periodic table?
100
An atom that gains or loses electrons.
What is an ion?
100
The number of protons in an atom.
What is atomic number?
200
A dense positively charged particle located in the center of the atom.
What is a proton?
200
Proposes that electrons orbit the nucleus like planets orbiting the sun.
What is Bohr's model?
200
Elements arranged according to atomic number show similarities in regular patterns.
What is periodic law?
200
Atoms that lose electrons and become positively charged. Examples include Li+, Ca+
What are cations?
200
The total number of protons and neutrons in an atom.
What is "Atomic Mass Number"
300
Atoms are electrically neutral.
What is the overall charge on an atom.
300
Regions around the nucleus where electrons exist.
What is an energy level?
300
Horizontal rows across the periodic table.
What is a period?
300
An atom that gains an electron and becomes negatively charged. Examples include Cl-, F-, Br-.
What is an anion?
300
Atoms with the same number of protons but different numbers of neutrons.
What are isotopes?
400
Particles that surround the center of an atom. Have and overall negative (-) charge.
What are electrons.
400
This model proposes that electrons are more like waves on a vibrating string than particles.
What is the new model of the atom?
400
Valence electrons
What determines chemical properties in atoms.
400
The process of adding electrons to or removing electrons from an atom or group of atoms.
What is ionization?
400
Subtract the atomic number from the mass number.
How do you find the neutron number in a atom?
500
Protons have a positive charge. Neutrons have no charge. Protons and neutrons have about the same mass.
How are protons and neutrons different? Similar?
500
The exact position, speeds, and direction of electrons in an atom cannot be determined.
How are electrons like spinning blades in a fan?
500
Vertical columns of elements on the periodic table. There are eighteen columns.
What are groups?
500
Fluoride, Chloride, Bromide.
What are examples of negative ions?
500
An average mass of all the isotopes of an element.
What is average atomic mass.
M
e
n
u