A user is constructing an ionic bond between magnesium and oxygen and has reached the stage below. What should the user do next? [Take time to study the picture before you answer]

Lithium nitride has the chemical formula Li3N. Potassium is in the same chemical family as lithium. What is the formula of potassium nitride?
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The diagram above represents the formation of lithium oxide from its elements. Which of the following statements provides the best explanation of the chemical reaction?
Which element is most likely to chemically combine with strontium (Sr) in a 1:1 ratio?
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A portion of the periodic table is shown below. Which column of elements would be most likely to chemically combine with calcium in a 1:1 ratio?
Which of the following would be the best formula for lead (IV) nitride?
Which type of element will always become a negative ion
What is the formula for sodium chloride?
Which is the correct name for BeF2?
What is the formula for calcium fluoride?
What is the name of K2S?