The electronic configuration of magnesium is:
1s² 2s² 2p⁶ 3s² = [Ne] 3s²
This means that for a magnesium atom, in order to have its outermost orbital full, the easiest way would be to lose the two outermost electrons. This is seen in its relatively low first two ionization energies. <u>The third ionization energy is several times higher because the ion would move from a stable form to an highly unstable form.</u> (Mg⁺² → Mg⁺³ + e⁻).
- Sodium only has one electron in its outermost orbital, so its first ionization energy would be several times lower than the second.
Atomic number is Z. Z=number of protons, so Z=11
I think the answer is 10g
when you freeze a specific amount of water into an ice cube, only the form and the density is changed, while the mass will be pretty much the same.
Probably the mass of the melted water will be a little bit less than the cube (if count the mass that released to the air) , but the amount will NOT BE SIGNIFICANT.
