13. D
14. A
15. C
16. B
17. F
18. E
the answer to your question is
volume
Usually you would call this a saturated solution. I hope this helps.
B. When electrons gain energy, they have the power to move up to a higher energy level in an atom.
Density gives mass of object per volume...... Here, density is given 8.90 g/cm3 therefore, per cubic centimeter contains 8.90 g Ni. mole of Ni = mass / atomic mass = 8.90 / 58.6934 = 0.1516 mole number of atoms: mole * 6.022 * 10^23 = 0.1516 * 6.022 * 10^23 = 0.9129 * 10^23 = 0.9 * 10^23 (approx.)