The charges for four ions are sodium (na) +1, calcium (ca) +2, fluorine (f) –1, and sulfur (s) –2. which would be an ionic bond that could form from any of these ions? naca2 na2s caf fs

Na₂S

Explanation:

Each of the atoms carry a charge with them, since sodium is in group 1 of the periodic table, it only needs to lose one electron in order to have a stable orbital. Hence when it loses a (negative) electron, the result is a positively charged ion (Na⁺). Similarly, when a group 7 atom such as fluorine obtains a stable orbital, it accepts an electron, since it is one short from its octet, and this creates a negatively charged ion (F⁻). The same thing can be said for atoms that gain or lose two electrons, and so forth.

A stable compound is created when ionic atoms form an overall neutral compound, such as NaCl. On its own, sodium in solution has a charge of +1, and chlorine has a charge of -1, so when combined, they cancel each other's charge, to produce a stable compound.

Taking the overall charges of the different compounds:

NaCa₂ = Na (+1) + 2Ca 2(+2) = (+1) + 2(+2) = +5 (unstable)

Na₂S = 2Na 2(+1) + S (-2) = 2(+1) + (-2) = 0 (stable)

CaF = Ca (+2) + F (-1) = (+2) + (-1) = +1 (unstable)

FS = F (-1) + S (-2) = (-1) + (-2) = -3 (unstable)

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it