The table shows the atomic structure of four elements.ElementNumber of electronsNumber of neutronsNumber of protonsElectron configurationW1112112, 8, 1X1516152, 8, 5Y1718172, 8, 7Z1822182, 8, 8Question promptWhich two elements can form an ionic compound?Question response areaSelect one optionW and ZW and YX and YY and Z
Question
The table shows the atomic structure of four elements.ElementNumber of electronsNumber of neutronsNumber of protonsElectron configurationW1112112, 8, 1X1516152, 8, 5Y1718172, 8, 7Z1822182, 8, 8Question promptWhich two elements can form an ionic compound?Question response areaSelect one optionW and ZW and YX and YY and Z
Solution
Ionic compounds are formed when one atom donates one or more electrons to another atom, creating ions that are positively and negatively charged. These ions are attracted to each other, forming an ionic compound. This usually happens between a metal (which donates electrons and becomes a positive ion) and a non-metal (which accepts electrons and becomes a negative ion).
In the periodic table, metals are typically on the left side and non-metals on the right. The number of valence electrons (the electrons in the outermost shell, shown in the electron configuration) can help determine whether an element is likely to donate or accept electrons.
Elements that have 1, 2 or 3 electrons in their outer shell (like W with its electron configuration of 2, 8, 1) are likely to donate electrons and form positive ions. Elements that have 5, 6, 7 or 8 electrons in their outer shell (like Y with its electron configuration of 2, 8, 7 and Z with its electron configuration of 2, 8, 8) are likely to accept electrons and form negative ions.
Therefore, the elements that can form an ionic compound are W and Y.
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