Question

what is the correct formula for a compound containing strontium and phosphorous?
psr
srp
sr3p2
sr2p3

Explanation:

Step1: Determine ion charges

Strontium (Sr) is in Group 2, so it forms a $Sr^{2 + }$ ion. Phosphorus (P) is in Group 15 and forms a $P^{3 - }$ ion.

Step2: Balance charges

To balance the charges in the compound, we need to find the least - common multiple of 2 and 3, which is 6. We need 3 $Sr^{2+}$ ions ($3\times2 = 6$) and 2 $P^{3 - }$ ions ($2\times3=6$).

Answer:

C. $Sr_3P_2$