If you push on a wall with 200n with what forth with the wall push back

According to newtons law every action has a equal reaction therefore it will push back 200n aswell

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