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which formula is an ionic compound?

naf

no2

co2

n2

Why is permeable soil best for plants that need a lot of drainage?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.