using the \nas\ idea, how many electrons are \needed\ for the compound pf3? 32 16 26

Explanation:

Step1: Determine valence - electrons of each atom

Phosphorus (P) is in Group 5A, so it has 5 valence electrons. Fluorine (F) is in Group 7A, and each F atom has 7 valence electrons. In PF₃, there is 1 P atom and 3 F atoms.

Step2: Calculate total needed electrons using the octet - rule

The octet - rule states that atoms tend to have 8 electrons in their outer shell (except H which has 2). For PF₃, P wants to complete its octet and each F wants to complete its octet. The total number of electrons needed is calculated as follows: For P, it needs 8 electrons and for each of the 3 F atoms, they each need 8 electrons. So the total number of electrons needed is (8 + 3\times8=32).

Answer:

32