find the element in period 4 that would bond with strontium

A and B

Explanation:

A is correct.

Sp hybridization involves the mixing of one s orbital and one p orbital. There is an equivalent sharing of character and hence the hybrid orbital exhibit 50% s character and 50% p character.

B is correct

B is correct because Sp2 hybridization is formed as a result of the mixing of one s orbital and 2 p orbitals.

C is incorrect.

Sp3 hybridization are oriented 109.5 degrees away from each other