Periodic Table Vocabulary
Alkali metalsAny of the highly reactive elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table. The alkali metals react with water.
Alkaline Earth MetalsThe alkaline earth metals are a series of elements comprising Group 2 of the periodic table. The alkaline earth metals have two valence electrons.
HalogensAny of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group of the periodic table. The Halogens have seven valence electrons.
Inner transition elements- elements in the periodic table that have three shells filled with electrons, the shells are usually the three outer shells. The Lanthanide Series are a part of the inner transition metals.

Lanthanide Seriesthe rare-earth elements with atomic numbers 57 through 71; having properties similar to lanthanum. The lanthanide series has 15 elements.
Actinide seriesa series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium. The Actinide series contains radioactive elements.
Noble gasesAny of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table. The noble gas neon is used in neon signs.
Transition elementsAny of the metallic elements within Groups 3 to 12 in the Periodic Table that have an incomplete inner electron shell and that serve as transitional links between the most and the least electropositive in a series of elements. The number of valence electrons in the transition elements varies.

Representative elements- An element whose highest occupied s or p sublevels are partially filled. They are the elements in groups 1A-8A in the Periodic Table. They display a wide range of physical and chemical properties. Hydrogen is a Representative element.
Chemical family-A group of elements in the Periodic Table, or more commonly, compounds that share certain physical and chemical characteristics and a common name. Noble gasses are a c hemical family.
Atomic number- The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table. Boron’s atomic number is 5.
Periodic Table- A periodic table is a tabular display of the chemical elements, organized on the basis of their atomic numbers, electron configurations, and recurring chemical properties. We went over the periodic table in class.

Protons- A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge. Protons are positive.

Neutronsis a subatomic hadron particle which has the symbol n or n0, no net electric charge and a mass slightly larger than that of a protons. Neutrons have a neutral charge.
Electronsis a subatomic particle with a negative elementary electric charge. Electrons have negative charges.

Subatomic Particle- A body having finite mass and internal structure but negligible dimensions.
They are very small particles .
The nucleus is the very dense region consisting of protons and neutrons at the center of an atom. Nucleus is at the center.
Electric Charge- is a physical property of matter that causes it to experience a force when near other electrically charged matter. Electric charges are pretty cool .

Valence Electrons- is an electron that is associated with an atom, and that can participate in the formation of a chemical bond. They are on the outer ring.
Atomic Mass- The mass of an atom or a molecule is often called its atomic mass. All elements have atomic mass.
Groups- Now you know about periods. The periodic table also has a special name for its columns. When a column goes from top to bottom, it's called a group.

Periods- Even though they skip some squares in between, all of the rows go left to right. When you look at a periodic table, each of the rows is considered to be a different period.
Metals- We wanted to give you a big overview of metals before we get into details about specific families. Almost 75% of all elements are classified as metals. They are not all like silver
(Ag), gold (Au), or platinum (Pt). Those are the very cool and shiny ones. There are other metals like potassium (K) and iridium (Ir) that you might not think about right away.

Non-Metals-is a term used in chemistry when classifying the chemical elements. On the basis of their general physical and chemical properties, every element in the periodic table can be termed either a metal or a nonmetal. (A few elements with intermediate properties are referred to as metalloids).
Metalloids- A metalloid is a chemical element with properties that are in between or a mixture of those of metals and nonmetals, and which is considered to be difficult to classify unambiguously as either a metal or a nonmetal .

Chemical Symbol an abbreviation or short representation of a chemical element; the symbols in the periodic table. Boron’s chemical symbol is B.