50 points! hydrogen gas and oxygen gas are combined to form water (h2 + o2 → h2o). is this a chemical change or a physical change? explain your answer.

The image shows a process that releases nuclear energy which statement best identifies the process shown the process must be fusion because energy is released the process must be fusion because of have your nucleus formed a smaller nuclei the process must be fission because a large nucleus breaks into smaller nuclei the process must be fission because neutrons are formed

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

To apply in a gold the individual gold atoms are united to each other by means of a metallic bond. how would you use the gold block to determine the atomic radius of a gold atom?