Studying Atoms
Structure of an Atom
Modern Atomic Theory
Scientists
Potpourri
100
Objects with like electrical charges will ______ each other.
What is repel?
100
Protons have this kind of charge.
What is positive?
100
True or False. When electrons release energy, some of the energy may be released as visible light.
What is true?
100
The scientist who used gold foil experiments to find the nucleus of atoms.
Who is Rutherford?
100
In Rutherford experiment what caused some of the alpha particles to bounce straight back from the gold foil?
What is nuclei in the gold atoms?
200
Objects with opposite electric charges will _____________ each other.
What is attract?
200
Electrons have this kind of charge?
What is negative?
200
When trying to predict the locations and motions of electrons in atoms, scientists must work with ___________
What is probability?
200
Greek philosopher who coined the word for a tiny piece of matter that cannot be divided?
Who is Democritus?
200
In an atomic model that includes a nucleus, positive charge is located where?
What is concentrated in the center of the nucleus?
300
The dense, positively charged mass located at the center of the atom is
What is nucleus?
300
Neutrons have this kind of charge?
What is no charge or neutral?
300
When an atom has all of its electrons in their lowest energies it is stable this is called the atom's _________ __________
What is ground state?
300
According to this philosopher all matter was made up of four elements- earth, air, fire ,and water
Who is Aristotle?
300
To find the number of neutrons in an atom, you would subtract atomic number from this
What is mass number?
400
True or False. All elements are composed of atoms.
What is true
400
The atomic number equals the number of these in an atom of an element?
What is protons?
400
This is a model to describe the possible locations of electrons around the nucleus.
What is electron cloud?
400
The scientist who discovered electrical charges that provided evidence for subatomic particles.
Who is Thomson?
400
This is unique for any given element
What is number of protons?
500
Uranium gives off fast moving particles with a positive charge, these particles are called ....
What is alpha particles?
500
Isotopes of an element have the same atomic number but different _____________ ____________ because they have different numbers of neutrons.
What is mass number?
500
An electron in an atom can move from one energy level to another when the atom _______ or ______ energy.
What is gains or loses?
500
Scientist who described atoms putting emphasis on electrons.
Who is Bohr?
500
The glowing of a neon light is caused by electrons emitting energy as they do this.
What is move from higher to lower energy levels?
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