Question

complete the table below. for example, in the first row decide whether sc³⁺ is a cation or anion. in the second row, write the symbol for the ion that an atom of strontium is mostly likely to form and then decide what type of ion it is.

element	most likely ion
scandium	sc³⁺	cation anion
strontium		cation anion
iodine		cation anion
phosphorus		cation anion
cesium		cation anion

Explanation:

Step1: Determine strontium ion

Strontium is in group 2, it loses 2 electrons to form $Sr^{2 +}$, a cation.

Step2: Determine iodine ion

Iodine is in group 17, it gains 1 electron to form $I^{-}$, an anion.

Step3: Determine phosphorus ion

Phosphorus is in group 15, it gains 3 electrons to form $P^{3 -}$, an anion.

Step4: Determine cesium ion

Cesium is in group 1, it loses 1 electron to form $Cs^{+}$, a cation.

Answer:

element	most likely ion
scandium	$Sc^{3+}$	cation
strontium	$Sr^{2+}$	cation
iodine	$I^{-}$	anion
phosphorus	$P^{3 -}$	anion
cesium	$Cs^{+}$	cation