Four student measured the mass of apieces of metal whose accurate mass is 34.75g. their result are 34.2g,33.75g,35.0g,34.69g. what is the best estimate for the mass of the pieces of metal? explain why?

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

Must be negative.substance increases

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this