Atom

The basic unit of a chemical element, consisting of a nucleus composed of protons and neutrons, surrounded by a cloud of negatively charged electrons.

2.6.B conduct a descriptive investigation to explain how physical properties can be changed through processes such as cutting, folding, sanding, melting, or freezing;

3.6.C predict, observe, and record changes in the state of matter caused by heating or cooling in a variety of substances such as ice becoming liquid water, condensation forming on the outside of a glass, or liquid water being heated to the point of becoming water vapor (gas);

6.6.C identify elements on the periodic table as metals, nonmetals, metalloids, and rare Earth elements based on their physical properties and importance to modern life

6.6.E identify the formation of a new substance by using the evidence of a possible chemical change, including production of a gas, change in thermal energy, production of a precipitate, and color change.

7.6.A compare and contrast elements and compounds in terms of atoms and molecules, chemical symbols, and chemical formulas*

7.6.B use the periodic table to identify the atoms and the number of each kind within a chemical formula