Halogen lights

• cid_basic
• Upper Primary
• Science
• VI. Grouping and classifying materials
• 36. Elements

oxygen, carbon, hydrogen, nitrogen, silicon, aluminium, iron, fluorine, calcium, sodium, sulphur, phosphorus, magnesium, potassium, zinc, copper, groups, group, chlorine, iodine, manganese, boron, gold, silver, mercury, radium, uranium, thorium, lead, cadmium, periodic table, chromium, molybdenum, nickel, cobalt, germanium, helium, lithium, tin, platinum, tungsten, bromine, vanadium, palladium, polonium, non-metals, iridium, tellurium, non-metal, beryllium, neon, xenon, barium, noble gases, argon, noble gas, radon, titanium, gallium, arsenic, caesium, rubidium, strontium, astatine, halogen, reactive metals, plutonium, thulium, bismuth, technetium, americium, samarium, antimony, europium, osmium, francium, ytterbium, hafnium, neptunium, cerium, tantalum, transition element, scandium, lanthanum, rhodium, actinium, Indium, protactinium, yttrium, zirconium, niobium, ruthenium, rhenium, rutherfordium, dubnium, seaborgium, bohrium, hassium, meitnerium, darmstadtium, roentgenium, praseodymium, neodymium, promethium, gadolinium, terbium, dysprosium, holmium, erbium, lutetium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, lawrencium, reactive metal, halogen lights, lights