Main Vocabulary
The smallest particle in an element.
What are atoms?
Who published the atomic theory?
Who was John Dalton?
He created the periodic table.
Who was Dmitri Mendeleev?
A solid substance.
What is a precipitate?
An arrangement of elements in order of atomic mass.
What is the periodic table?
The positively charged particles of atoms.
What are protons?
He rearranged the periodic table.
Who was Henry Mosely?
An expression that uses symbols to show a relationship between a reactant and product.
What is a chemical equation?
The process in which atoms rearrange to produce a new substance.
What is a chemical reaction?
The uncharged particles of atoms.
What are neutrons?
The number of protons in the nucleus.
What is an atomic number?
It says that matter cannot be created nor destroyed.
The negatively charged particles in atoms.
What are electrons?
The total number of protons and neutrons in an atom's nucleus?
What is an atomic mass number?
A reaction in which energy is absorbed.
What is an endothermic reaction?
Where electrons circle around the nucleus.
What is the electron cloud?
The abbreviation for an element's name.
A reaction in which energy is released.
What is an exothermic reaction?