PLEASE HELP Which two elements are mainly found in the inner and outer core? A. Fe and Ni
B. Fe and Si
C. Ni and Si
D. Ni and C

PLEASE TELL ME WHAT THOSE ABREVIATIONS MEAN ALSO

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.

Yes it would be a physical change.

Show and image of the mixtures or write them