Answer:
20
Explanation:
number of protons+ number of neutrons= mass of atom
19+n=39
n=39-19=20
number of neutrons=20
Answer:
Jupiter's moons are orbiting Jupiter while Jupiter's position doesn't change. Each day, there are some moons visible, while others are hidden behind Jupiter.
Answer:
The correlation is: as the same mass of metal moves toward the interior of the Earth, more of the weight of the planet squishes down on the metal, making it more dense.
Explanation: