elements (basics)

• what are the elements in alkali metals?

  Lithium, sodium, potassium, rubidium, cesium, and francium.
• what are the elements from atomic number 21 to 30?

  Scandium, Titanium, Vanadium, Chromium, Manganese, Iron, Cobalt, Nickel, Copper, Zinc
• what elements are in the halogens?

  Fluorine, chlorine, bromine, iodine, astatine.
• what elements are in noble gases?

  Helium, Neon, Argon, Krypton, Xenon, Radon