Stated matter is made of small pieces and atoms are "uncuttable"

Stated atoms of different elements are different from one another and atoms are small, solid particles. His model is called the Billiard Ball Model.

Discovered electrons. His model is called the Plum Pudding Model.

Stated atoms contain mostly empty space and that electrons move randomly around a positively charged nucleus.

Stated that electrons travel in definite paths called shells and that electrons can jump between shells. His model is called the Planetary Model.

Stated that the neutron has no electrical charge and has a mass equal to the proton.

Current model of the atom in which a charged electron cloud is found around a nucleus.

a positively charged subatomic particle that is found in the nucleus of an atom

a negatively charged subatomic particle that is found in the space outside the nucleus of an atom

a neutral, subatomic particle in an atom's nucleus that has a mass nearly equal to that of a proton

Center of an atom, contains protons and neutrons

Path around the nucleus, where the electrons reside

Found on the periodic table. Represents the number of protons and electrons in a neutral atom.

Atoms of the same element that have different numbers of neutrons

A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together.

Anything that takes up space and has mass

The average mass of all the isotopes of an element (The decimal on the periodic table)

The sum of the number of neutrons and protons in an atomic nucleus (The rounded version of the atomic mass)

model of the atom in which electrons move rapidly around the nucleus in paths called orbits

A model of an atom in which each dot represents a valence electron. The dots surround the element's chemical symbol.

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Atoms

Atomic Theory & Structure

Question	Answer
Democritus	Stated matter is made of small pieces and atoms are "uncuttable"
John Dalton	Stated atoms of different elements are different from one another and atoms are small, solid particles. His model is called the Billiard Ball Model.
J.J. Thomson	Discovered electrons. His model is called the Plum Pudding Model.
Ernest Rutherford	Stated atoms contain mostly empty space and that electrons move randomly around a positively charged nucleus.
Niels Bohr	Stated that electrons travel in definite paths called shells and that electrons can jump between shells. His model is called the Planetary Model.
James Chadwick	Stated that the neutron has no electrical charge and has a mass equal to the proton.
Electron Cloud Model	Current model of the atom in which a charged electron cloud is found around a nucleus.
Proton	a positively charged subatomic particle that is found in the nucleus of an atom
Electron	a negatively charged subatomic particle that is found in the space outside the nucleus of an atom
Neutron	a neutral, subatomic particle in an atom's nucleus that has a mass nearly equal to that of a proton
Nucleus	Center of an atom, contains protons and neutrons
Energy Level	Path around the nucleus, where the electrons reside
Proton's charge	Positive
Electron's charge	Negative
Parts of the nucleus	Protons and neutrons
Neutron's charge	None
Atomic number	Found on the periodic table. Represents the number of protons and electrons in a neutral atom.
Isotope	Atoms of the same element that have different numbers of neutrons
Element	Made of one kind of atom
Periodic Table	A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together.
Matter	Anything that takes up space and has mass
Atomic Mass	The average mass of all the isotopes of an element (The decimal on the periodic table)
Mass Number	The sum of the number of neutrons and protons in an atomic nucleus (The rounded version of the atomic mass)
Bohr Model	model of the atom in which electrons move rapidly around the nucleus in paths called orbits
Lewis Dot Structure	A model of an atom in which each dot represents a valence electron. The dots surround the element's chemical symbol.

Created by: user-1975441

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