Anything that has mass and volume

Sulfur, because it is a nonmetal. We saw this in the metals, nonmetals, metalloids lab.

Homogeneous mixtures. The metals are not bonded together

Phosphorous (P) is in period 3, so it has 3 energy levels

Metals

Elements are composed of one type of atom, compounds two or more types of atom

Ar is a noble gas. Noble gasses have a full valence shell, so they are energetically stable

Sulfur's atomic number is 16, so it has 16 protons

Calcium's atomic number is 20, so it has 20 protons. A neutral atom has the same number of protons and electrons, so 20.

Increasing atomic number

Physical changes result in a decrease, increase, or spread of molecules. For example, when ice melts into water, the H2O molecules do not change.