Atoms vocab

Atomic Number, Chemical Symbol, Atomic Mass, Element Name

It is the number of protons in the nucleus if an atom

It contains 1 or 2 letter. It is an abbreviation of the element’s name in English or Latin

It is the average mass of all the isotopes of that element

They are located on the left side of the periodic table and have physical properties

Luster, Malleability, Ductility, Thermal conductivity, Electrical conductivity, Solid at room temperature (except for Mercury)

Means shiny & reflective

The ability to transfer heat

The ability to be drawn into thin wires

The ability to be hammered or rolled into flat sheets

The ability to carry electric

Group 1; Soft and silvered colored solids and are the most reactive metals on the table because they have only 1 valence electron.

Group 2; The elements are silver-colored solids and they are very reactive but not as much as group 1. Each element in this group has 2 valence electrons.

Group 3-12; Are less reactive than the metals in group 1 & 2

They are located on the right side of the periodic table (except for Hydrogen) and have physical properties.

Dull, Brittle, Poor conductors of electric current & heat, Lower densities than metals (usually), Many are gases at room temperature

Some nonmetals (7) naturally occur as diatomic molecules, which means they have 2 atoms bonded together.

Group 17; They are very reactive and the elements in this group has 7 valence electrons.

Group 18; They are usually nonreactive and the elements in this group has 8 valence electrons (except for Helium, which has 2)

The metals and the nonmetals on the periodic table are the metalloids. They have some properties of metals and some properties of nonmetals.

Semiconductors

They are substances that can conduct electric current under some conditioned but not others.

Computer Chips, Transistors, Lasers