The __ number is the total number of protons and neutrons
A group of electrons revolving around a nucleus forms an electron __
The word atom is __ for indivisible or uncuttable
__ are solids at room temperature and conduct electricity and heat
Protons and neutrons are hadrons, made up of __
Protons and neutrons are held together by __ nuclear forces
The chemical __ is a letter or pair of letters representing an element
An __ is defined by the number of protons it has
Protons are subject to __, electromagnetic, weak and strong forces
A __ has similar mass as a proton, but without any charge
The __ is the center of an atom
Particle __ studies the matter and radiation of subatomic particles
__ mechanics describes the observed properties of the atom
The __ shell includes the electrons orbiting furthest from the nucleus
An element cannot be broken down by __ means
__ are atoms of the same element, but with different masses
A __ consists of two or more joined elements, like H2O or CO2
An electron has a __ charge
The __ Table organizes elements in rows and columns
A proton has a __ electrical charge
Dmitri __ is often given credit for creating the Periodic Table
Protons, neutrons and electrons are __ particles
The __ __ was discovered in 2012 after 48 years of research
A period is the __ row on the periodic table
Elements in columns share similar chemical __
The Large Hadron Collider at CERN is the world's largest particle __
The __ __ is equal to the number of protons in the nucleus of an atom
An ion is an __ charged atom or group of atoms