Ch 16 vocab IPC

Proton

Particle in the nucleus with an electric charge of +1

Quark

Particle of matter which make up protons and neutrons

Atomic number

Number of protons in an atoms nucleus

Average atomic mass

Weighted average mass of an elements isotopes according to their natural abundance

Group

Vertical columns in the periodic table, numbered 1- 18

Atom

The smallest particle of an element that retains the properties of that element

Neutron

Electrically neutral particle inside the nucleus of an atom

Electron cloud

Area around the nucleus of an atom where electrons are most likely to be found

Mass number

The sum of the number of protons and the number of neutrons

Periodic table

An organized list of all unknown elements, arranged by increasing atomic number, and by changes in chemical and physical properties

Electron dot diagram

Uses the symbol for an element and dots representing the number of electrons in an elements outer energy level

Nucleus

The small, positively charged center of an atom, contains protons and neutrons

Electron

The particle with an electric charge of negative one, surrounds the nucleus of an atom

Isotope

Atom of an element that has a specific number of neutrons

Period

Horizontal rows of elements on the periodic table