Chemistry Concepts SUNY Cortland Chapters 2-5

Front

Atomic mass units (amu)

Back

Tiny units to measure atom masses.

Front

Protons / Neutrons / Electrons

Back

Protons: Positive charge, in the nucleus. Neutrons: No charge, in the nucleus. Electrons: Negative charge, orbit the nucleus.

Front

Nuclide symbol

Back

Shorthand for an atom (shows element, mass, and atomic number).

Front

Isotopes

Back

Atoms of the same element with different numbers of neutrons.

Front

Average atomic mass

Back

Weighted average of isotopes' masses.

Front

Percent abundance

Back

How much of each isotope exists naturally.

Front

Group names

Back

Names for columns on the periodic table (like alkali metals).

Front

Law of multiple proportions

Back

Elements combine in simple whole-number ratios.

Front

Empirical vs Molecular Formula

Back

Empirical: Simplest ratio of atoms. Molecular: Actual number of atoms.

Front

Common ion charges

Back

Typical charges ions get (like +1, -2).