what ionic compounds could you form from the following?

Sodium
Calcium
Neon
Phosphorus
Chlorine

i have NaCl, CaCl2, Na3P, and Ca3P2

is that all and can neon be used?

I think you have all of them. P and Cl will form PCl3 and PCl5 but those compounds are polar covalent (Electronegativity difference of about 1 so they are about 25% ionic and 75% covalent [approximately]).

From the given elements, the possible ionic compounds that could be formed are:

1. Sodium Chloride (NaCl)
2. Calcium Chloride (CaCl2)
3. Sodium Phosphide (Na3P)
4. Calcium Phosphide (Ca3P2)

Neon, being a noble gas, does not typically form ionic compounds.

To determine the ionic compounds that can be formed from the given elements, we need to consider the valence electrons of each element and their tendency to gain or lose electrons to achieve a stable electron configuration.

1. Sodium (Na) - Sodium is a Group 1 element with one valence electron. It tends to lose this electron to achieve a stable electron configuration, forming a +1 cation.
- Sodium can combine with Chlorine (Cl) to form Sodium Chloride (NaCl), where Sodium loses its electron and Chlorine gains it.

2. Calcium (Ca) - Calcium is a Group 2 element with two valence electrons. It tends to lose these electrons to achieve a stable electron configuration, forming a +2 cation.
- Calcium can combine with Chlorine (Cl) to form Calcium Chloride (CaCl2), where Calcium loses two electrons, and each Chlorine atom gains one electron.

3. Neon (Ne) - Neon is a noble gas element with a full outer electron shell. It does not readily gain or lose electrons to form ions, as it already has a stable electron configuration.
- Therefore, Neon does not form ionic compounds.

4. Phosphorus (P) - Phosphorus is a Group 15 element with five valence electrons. It tends to gain three electrons to achieve a stable electron configuration, forming a -3 anion.
- Phosphorus can combine with Sodium (Na) to form Sodium Phosphide (Na3P), where Phosphorus gains three electrons, and each Sodium atom loses one electron.
- Phosphorus can also combine with Calcium (Ca) to form Calcium Phosphide (Ca3P2), where each Phosphorus atom gains three electrons, and each Calcium atom loses two electrons.

In conclusion, from the given elements, the ionic compounds that can be formed are:
- Sodium Chloride (NaCl)
- Calcium Chloride (CaCl2)
- Sodium Phosphide (Na3P)
- Calcium Phosphide (Ca3P2)

Neon does not form ionic compounds as it already has a stable electron configuration.