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History of Atoms
Parts of Atoms
Properties of Atoms
The Periodic Table
Miscellaneous
100
He was the first person to suggest that matter was made up of atoms.
Who is Democritus
100
This is the center of an atom
What is nucleus
100
Atoms are considered neutral because they have equal numbers of these.
What are protons and electrons
100
The vertical columns on the periodic table
What are groups
100
Unit used to measure the amount of a substance
What is a mole
200
In Greek, the word "atom" means this.
What is "unable to be divided"
200
The nucleus is made of these two particles.
What are protons and neutrons
200
The process where atoms gain or lose electrons to become charged
What is ionization
200
The horizontal rows on the periodic table
What are periods
200
The weighted average of the mass of all isotopes of an atom
What is average atomic mass
300
According to Dalton's atomic theory, all atoms of a given element are this.
What is exactly alike.
300
The charge of an electron
What is negative
300
According to Bohr's model of the atom, electrons behave like this.
What are planets orbiting the Sun
300
Location of nonmetals on the periodic table
What is the right side
300
The number of protons and neutrons in an atom
What is mass number
400
Dalton's theory tells us that atoms of different elements can combine to form this.
What are compounds
400
The charge of a nucleus
What is positive
400
According to modern atomic theory, this is where electrons are located
What is the electron cloud
400
This determines the order of elements in the periodic table
What is the number of protons
400
Elements or compounds that conduct electric current better than an insulator, but not as well as a conductor
What are semiconductors
500
Dalton's theory was accepted while Democritus' was not because Dalton had this.
What is evidence.
500
This can never be known about electrons.
What is their exact location
500
These determine chemical properties for atoms.
What are valence electrons
500
All atoms in the same group will have the same number of these.
What are valence electrons
500
1/12 the mass of a carbon atom with mass number 12
What is an atomic mass unit