How is momentum similar to inertia? explain.

50% of the law of inertia (newton's 1st law) is that an object in motion tends to stay in motion unless acted upon by an outside force. Momentum is that force that makes an object want to keep moving. Same reason that if a moving car on a highway were to go into neutral, it would keep going rather than stop dead in its tracks

668900 atoms in total

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