If a chemical equation is balanced, does it support the Law of Conservation of Matter?

Yes because every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed.

Yes she is correct. the answer is completely correct

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