The Atom
The smallest particle in which elements can be divided and still stay in the same unit.
What is an atom?
number of protons and neutrons in the atom's nucleus
What is the mass number?
Elements that are shiny and conduct heat and electricity well.
What is a metal?
When substances are mixed to create an new substance
What is a chemical reaction?
positively charged particles
What is a proton?
A Russian chemist who invented the periodic table.
Who is Dmitri Mendeleev?
Poor conductors of heat and electricity, and are dull and brittle.
What are nonmetals?
Uses chemical symbols and numbers to represent given substance.
What is a chemical formula?
It is the place that holds protons and neutrons in the atom.
What is a nucleus?
the elements arranged by increasing atomic number
What is the periodic table?
Elements that have both the properties of metals and nonmetals.
What are metalloids?
An expression that uses symbols to show the relationship between starting substances that produce chemical reactions.
What is a chemical equation?
negatively charged particles
What is an electron?
each horizontal row on the periodic table
What is a period?
CAn be shaped into different shapes.
What does malleable mean?
A substance that participates in chemical reaction
What are reactants?
the number of protons in an atom's nucleus
What is the atomic number
each vertical row on the periodic table.
What is a group?
Can be made into wires
What does ductile mean?
The substance that is formed in the reaction
What is a product?