How many electrons are in an atoms of germanium

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Which element is least likely to undergo a chemical reaction

Na chemical reaction, activation energy increases the of the reactants. this outcome causes the particles to collide, which results in the of new products.