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Chance Vocabulary Problems Discovery
100
The thought that electrons were mixed throughout an atom, like plums in a pudding.
What did the Plum-Pudding Model (chocolate chip ice-cream model) represent?
100
An atom.
The smallest unit of an element that maintains the properties of that element.
100
64
How many protons does an atom with an atomic number of 64 and a mass number of 78 have?
100
He propose that electrons are located in levels at certain distances from the nucleus.
What did Niels Bohr discover after studying the way that atoms react to light?
200
When an atom loses one or more electrons.
How does an atom become a positively-charged ion?
200
What is an atomic number?
The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element.
200
The diameter of an atom is 100,000 times bigger than the diameter of a nucleus.
How does the diameter of an atom compare to the diameter of a nucleus?
200
A Greek philosopher named Democritus
Who thought of the idea that you would eventually end up with a particle that could not be cut?
300
All substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed.
What is the Atomic Theory?
300
A region around the nucleus of an atom where electrons are likely to be found.
What is an electron cloud?
300
The Electron-Cloud Model
What model represents the current atomic theory?
300
J. J. Thomson
Who discovered electrons?
400
Aristotle
Who disagreed with Democritus’s idea that you would eventually end up with a particle that could not be cut?
400
An atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons.
What is an isotope?
400
When an electrons lose one or more electrons.
How does an atom become a positively-charged ion?
400
He made a new model of the atom, he proposed that in the center of the atom is a tiny, extremely dense, positively charged part called the nucleus.
What revision did Ernest Rutherford make to the Atomic Theory?
500
Gravitational force
Electromagnetic force
Strong force
Weak force.
What are the four basic forces at work everywhere in nature?
500
Atomic Mass Unit (AMU)
What is a unit of mass that describes the mass of an atom or molecule?
500
Objects with the same charge repel each other, while objects with the opposite charge attract each other.
What is an Electromagnetic Force?
500
He developed the Atomic Theory.
What did John Dalton do?




Chapter 11 Introduction To Atoms

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