He named the atom after a Greek word that means
"divisible"
who is Democritus
100
Smallest particle of an element that has all the properties of that element.
What is an atom?
100
This is the electron configuration for Bromine.
What is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5?
100
This represents the number of protons an atom has.
What is the atomic number?
100
He believed that electrons moved in orbits at fixed distances from the nucleus.
Who is Bohr?
200
This person came up with the first model of the atom.
Who is Dalton?
200
Subatomic particle with a positive charge, found in the nucleus of an atom
What is a proton?
200
This rule says that electrons fill the lowest energy level first before moving on to the next energy level.
What is the Aufbau principle?
200
This equals the number of protons plus the number of neutrons in an atom.
What is the mass number? (atomic mass)
200
energy levels
What are the possible energies that electrons can have?
300
He proposed that electrons orbit the nucleus similar to planets around the sun. He also, suggested that electrons were rotating around the nucleus, fixed in energy levels.
Who is Bohr?
300
Subatomic particle found in the nucleus with no charge.
What is a neutron?
300
1s2 2s2 2p6 3s2 is the electron configuration for this element
What is magnesium?
300
This can be used to figure the number of electrons in an atom.
What is the atomic number?
300
By gaining or losing energy.
How does an electron move from one energy level to another?
400
His theory is called the "plum pudding" model.
Who is Thomson?
400
Region around the nucleus of an atom occupied by electrons.
What is an electron cloud?
400
This is released when an electron jumps back down from the excited state.
What is a photon?
400
Sodium has this many electrons.
What is 11 electrons?
400
A region of space around the nucleus where electrons are likely to be found.
What is an orbital?
500
He proposed that all of an atom's positive charge is concentrated in its nucleus.
Who is Rutherford?
500
This is the smallest of the 3 known subatomic particles.
What is an electron?
500
This model of the atom suggests that there is a "probability" of finding the electron.
What is the electron cloud model?
500
Sodium has this many neutrons.
What is 12 neutrons?
500
Ground state.
What is when all electrons in an atom have the lowest possible energies?