Chemistry 1 Flashcards
Define Atom
The smallest unit of an element
Define Nucleus
The central part of the atom and is composed of protons and neutrons. It contains most of an atom’s mass.
Define Molecule
A group of atoms that are banned together
Define Quark
They make up particles like protons and electrons
Define Proton
A positively charged particle that is found inside the nucleus
Define Neutron
An uncharged particle that is found within a nucleus
Define Electron
A negatively charged particle that is located in the shells that surround that atom’s nucleus
Define Ions
Elements that have a positive or negative charge
Define Cations
An atom that is positively charged
Define Anion
An atom that is negatively charged
Define Valance Shell
The outermost shell of an atom
Define Valance Electrons
The electrons in the valance shell
Define Alkali Metals
The most reactive element on the periodic table
Define Noble Gases
The elements on the periodic table that don’t react
Define Octet
A shell that has 8 atoms (or is full)
