I think its A. it cant be C or D b/c we are measuring the distance between Earth and Saturn, not the speed.
Answer:
Atomic number is the number of protons in an isotope or element.
Explanation: The atomic number is the same number of protons in an element or isotope and if said isotope is neutral than it is the same number of electrons.
Example: Atomic number = 19 Protons = 19 if neutral Electrons = 19
Answer:
you must go to jones im doing the same test
Explanation:
15.999 is the mass of oxygen
