The horizontal rows of the periodic table are called this.
What are PERIODS?
Carbon-14 (atomic number 6) has THIS MANY neutrons.
What is EIGHT?
The sum of protons and neutrons in a SPECIFIC atom is called this.
What is THE MASS NUMBER?
Atoms of the same element with different numbers of neutrons are called this.
What are ISOTOPES?
Isotopes of the same element have the same number of THESE subatomic particles.
What is same number of protons and electrons
These basic subatomic particles are NOT considered when determining atomic mass.
What are ELECTRONS?
Elements in group 18 are known as THIS.
What are the NOBLE GASES?
The family with 7 valence electrons
What is halogens?
Elements that possess properties of metals AND non-metals are classified as THIS.
What are METALLOIDS?
An oxygen atom that has a charge of 2- has this many electrons
What is 10?
Electrons move from one of these to another when atoms gain or lose energy.
What is an energy level?