Which of these Noble Gas elements are reactive under conditions experienced on Earth? ASAP 1. He, helium
2. Ne, neon
3. Xe, xenon
4. None of them - they are called Noble Gases because they don't react!

Which type of reaction always has an element and a compound as reactants

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.