the atom
Too small to be seen and can't be cut
What is an atom?
The rows in the periodic table
What are periods?
A type of element with different number of neutrons
What is an isotope?
The bonds between atoms brake apart and form new ones
What is a chemical reaction?
A postitively charged particle
What is a proton?
The collumns in the periodic table
What are groups?
The number of protons and neutrons
What is atomic mass?
An enzyme used to speed up a reaction
What is a catalyst?
The middle of an atom that contains protons and neutrons
What is a nucleus?
What the periodic table is organized by
What is atomic number?
no element has the same atomic number
What is True?
A reaction where heat is released
What is an exothermic reaction?
to be unbreakable
What is the greek meaning of an atom?
Contains a "list" of all the elements
What is the periodic table?
THey make up the periodic table
What are elements?
A reaction where heat is absorbed
What is an endothermic reaction?
Located in the electron cloud and is a negitivly charged particle
WHat is an electron?
HE arranged the elements by atomic mass and predicted new elements to be discovered
Who is Dmitri Mendeleev?
Conducted experiments to study parts of an atom.
Who is Ernest Rutherford?
chemicals
What is everything made out of?