How many grams of CaH2 are needed to generate 145 L of H2 gas if the pressure of H2 is 823 torrtorr at 20 âC?

How many neutrons does a atom of cobalt have?

Which method would be best to separate a mixture of sand and gravel

Which of the following observations indicates that an atom has neutrons? some uncharged particles are scattered by a beryllium atom when it hits a gold foil. some uncharged particles bounce back from a gold foil when it is bombarded with alpha particles. a radiation consisting of uncharged particles is emitted when alpha particles strike beryllium atoms. a radiation which attracts electrons is produced when a beryllium atom is bombarded with alpha particles.