atoms and elements vocab

Matter

anything that has mass and takes up space(solid, liquid,gas)

Mass

a measurement of how much matter is in an object

Element

a pure substance that cannot be broken down into other substances

periodic table

arrangement of elements that’s sorted by increasing atomic number and group’s elements according to their properties

atom

the smallest particle of an element that still remains the property of an element

subatomic particle

particles that make up atoms(protons,neutrons,electrons)

electron

particles of electric charge of -1, surround the nucleus of an atom

valence electron

the elections in the outermost shel, or energy level, of an atom

electron cloud orbital/shell/energy level

The area surrounding the nucleus of an atom where the electrons are most likely to be found

neutron

electrically neutral particles inside the nucleus of an atom

nucleus

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

proton

particle in the nucleus with an electric charge of +1

atomic number

Number of protons in the nucleus(protons determine an atoms identity)

atomic mass

The decimal number used on the pediatric table which indicates the average mass of the nucleus

mass number

Number of protons and neutrons in the nucleus, it is the atomic mass rounded to the whole number with no decimals