The zigzag, staircase, line in the diagram of the periodic table above separates the metals, on the left, from non-metals, on the right. Hydrogen is a non-metal, but it is often put in the middle.

Developing the periodic table The periodic table was developed ... They tend to have opposite properties. Metals are mostly solids;, non-metals liquids or gases.

The calcium reacts with the water but does not get nearly as hot as either the sodium or potassium. Also, the calcium hydroxide produced forms a white solid in the solution which is different from the ...

Accompanying Lesson Plan: Lesson 3.2: Finding Volume—The Water Displacement Method The chart shows that atomic size and mass for the first 20 elements in the periodic table. The size of the atoms and ...