The columns of the periodic table.
What are families?
"Orbits" around the nucleus
What is an electron?
These two particles live in the nucleus of the atom.
What are protons and neutrons?
Contains two common metals, magnesium and calcium.
What is the Alkaline Earth Metals?
These elements are found to the right of the "staircase".
What are the non-metals?
These two particles are found in equal amounts for neutral atoms.
What are protons and electrons.
Elements of this family are missing one electron from having a completely full valence electron shell.
What are the Halogens?
These are the four main pieces of information found within a square of the periodic table.
What are atomic number, element symbol, element name, and atomic mass?
This element is found at the top of the halogens of the periodic table.
What is flourine?
The reactivity of all elemental families is based on this aspect of the atom.
How full is the valence electron shell of an atom? (or some variation)
Mendeleev solved major issues involving the patterns of the periodic when he ordered the elements by atomic number, rather than by this metric.
What is the atomic mass?
Though found left of the staircase, this element is often treated as a non metal.
What is hydrogen?