What does the 2 mean in helium?

What is the force exerted by the object you are trying to move? What is a person's average walking speed in kilometers per hour? What does erythropoiten do? A statement of nature that seems to be true is a scientific? How many grams of water are need to react with grams of ferric trichloride? What do you know about ecosystem? What is ligase? Why is it important to wear gloves and eye protection when changing a liquid propane gas cylinder? Can you list some biologists and their discoveries? Why can't you see or hold a gas? What paragraph is the core capabilities that are derived from the unit's mission of the units authorization document? Which Earth Science area has its formal beginning in the 1800s with studies by Darwin Cook and Thompson Oceanography Geology Meteorology or Astronomy? Can spiral bacteria be found in clusters? What does alkali metals form when it react with water? Why do ores look different from their metal? What does rhyolite taste like? What is the main occupation of the pampas? Where does the saying a second wind come from? Is fermentation reversible? If you wanted to trace the creation of tectonic plates using magnetic bands of normal and reversed polarity your best place to measure the magnetic stripes would be?