The atomic number represents the number of ____ in an atom.

• The atomic number represents the number of protons in an atom. It is used to organize elements on the periodic table in _____ order.

Groups contain elements that share similar ______ properties, such as their ability to bond with other elements

Periods contain elements with the same number of _____ (electron shells).

• Metals are typically ______,  and good conductors of heat and electricity.

• Nonmetals are typically _____, and poor conductors.

Metalloids have properties of both metals and nonmetals

• ____ are positively charged and found in the nucleus.

• ______ are neutrally charged and found in the nucleus.

_____ are negatively charged and orbit around the nucleus in electron shells