Majority of an atoms mass comes for protons and neutrons which makes up the nucleus.
Arteries carry blood away from the heart and veins carry blood back to the heart. Hope that helps (:
That is correct c
Explanation
The answer is 40.
We can solve this by finding out the number of protons, and neutrons. Atomic number of an element means the number of protons in that element. So, the atom has 30 protons if the atomic number is 30.
On the other hand, mass number is the total number of protons and neutrons, but not electrons, because they're too light comparing to the other 2. Therefore, we can simply solve the number of neutrons in the atom by subtracting the number of protons from the mass number. 70 - 30 = 40.
Therfore, the number of neutrons is 40.
Answer:
Yes
Explanation: Had a question like this and I said yes and got it right