Kai was 200 meters north of the library when he remembered he had to return some books to the library .it took him seconds to do the round trip. which best describes kais rountrip

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