Particles made of two or more atoms that are held together with bonds. Carbon
dioxide (CO2), sugar (C6H12O6), water (H2O), oxygen (O2), and hydrogen (H2) are
examples of molecules.
A chemical property describes how a substance is changed when it reacts with other substances.
An element is a substance that cannot be broken down by simple chemical and physical processes.
A compound is a substance made of two or more different kinds of atoms. Carbon dioxide (CO2), sugar (C6H12O6), and water (H2O) are compounds. Oxygen (O2) and hydrogen (H2) are not compounds.
An alloy is a mixture of two or more metals.
The smallest particle of an element is an atom.
The atomic number is equal to the number of protons in the nucleus of an atom.
Scanning Tunneling Microscope
A Scanning tunneling microscope (STM) is an instrument that can create images of arrays
A subatomic particle with a negative charge is called an electron.
Metals are Elements that may be shiny, stretch and bend, but don’t break, and conduct heat
and electricity well.
Neutron A subatomic particle with no charge is called a neutron
A gas that does not react with other element is called a Noble Gas.
The Nucleus is the center of an atom.
Periodic Table of Elements
A way to organize the elements based on atomic
number is called the periodic table of the elements.
A proton is a subatomic particle that has a positive charge.
A Chemical equation is a model of a chemical reaction showing reactants and products.
A Chemical formula is a code that tells how many and what kinds of atoms are in a
Conductivity is the ability of a substance to let heat and electricity pass through it. Metals conduct heat and electricity well, so they have high conductivity.