Unit 4 Periodic Table Test Review

A radioactive element is one that has an unstable nucleus and emits radiation as it decays into a more stable form.

Neptunium is considered radioactive.

Bromine is a nonmetal that is a reddish-brown liquid at room temperature and has properties similar to Fluorine (F).

Nitrogen has 10 electrons when it becomes an ion.

Transition Metals are elements found in groups 3-12 of the periodic table, known for their ability to form variable oxidation states and colored compounds.

Chlorine (Cl) is classified as a nonmetal.

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

The main groups include Alkali Metals, Alkaline Earth Metals, Transition Metals, Halogens, and Noble Gases.

An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net charge.

Nonmetals are generally poor conductors of heat and electricity, have high ionization energies, and are not malleable or ductile.