# data[].attributes.body
Halogens very reactive nonmetals because their atoms need to gain only one electron to have a complete outer level.

# data[].attributes.body
The nonmetal carbon can be found uncombined in nature.  Carbon also forms a wide variety of compounds.

# data[].attributes.body
Elements in the first row are  called Lanthanides. The lanthanides are shiny, reactive metals. Some of these elements are used to make steel.

# data[].attributes.body
Noble gases are unreactive nonmetals and are in Group 18 of the periodic table. The atoms of these elements have a full set of electrons in their outer level.

# data[].attributes.body
Oxygen is necessary for substances to burn. Oxygen is also important to most living things, such as the diver. Sulfur is another commonly found member of Group 16.

# data[].attributes.body
Although nitrogen is not very reactive, phosphorus is extremely reactive. In fact, in nature phosphorus is only found combined with other elements.

# data[].attributes.body
The most common element from Group 13 is aluminum. In fact, aluminum is the most abundant metal in Earth’s crust.

# data[].attributes.body
Elements in the second row are called actinides. All atoms of actinides are radioactive, or unstable. The atoms of a radioactive element can change into atoms of another element.

# data[].attributes.body
Transition metals tend to be shiny and to conduct thermal energy and electric current very well.

# data[].attributes.body
Alkaline-Earth Metals are less reactive than alkali metals are. Atoms of alkaline-earth metals have two outer-level electrons.

# data[].attributes.body
Alkali Metals are the most reactive metals because their atoms can easily give away the

# data[].attributes.body
Period is a horizontal row of elements is called a period.

# data[].attributes.body
A vertical column is called a group or family.