Vocabulary
A horizontal row of elements in the periodic table
What is a period?
The modern periodic table is arranged in order of
What is increasing atomic number?
A positively charged subatomic particle found in the nucleus of an atom
What is a proton?
Atoms with a charge
What is an ion?
The number of protons in an atom is called the
A vertical column of elements in the periodic table
What is a group?
As you move from right to left, metallic nature of the elements _________.
What is increases?
A negatively charged subatomic particle
What is an electron?
The elements in Group 1A
What are alkali metals?
The sum of protons and neutrons in the nucleus of an atom is called
What is the mass number?
The scientist that created the original version of the modern periodic table
Who is Mendeleev?
As you move from left to right, the valence electron trend is
What is increasing?
A subatomic particle with no charge and a mass of 1 amu found in the nucleus
What is a neutron?
The elements in group 7A
What are halogens?
Regions around the nucleus of an atom where electrons may be found
What are energy levels / orbitals / shells?
Electrons in the outermost shell of an atom
What are valence electrons?
These elements are extremely reactive metals with one valence electron
What are alkali metals?
Any atom or group of atoms with a negative charge
What is an anion?
The elements in group 2A
What are alkaline earth metals?
These elements are unreactive, colorless, and odorless
What are noble gasses?
The prefix used by Mendeleev as a placeholder to define an element that had not been discovered
What is -eka?
What is Oxygen?
Any atom or group of atoms with a positive charge
What is a cation?
The elements in group 8A
What are the noble gasses?
The weighted average of the masses of the isotopes of an element is called
What is the atomic mass / average atomic mass?