Consider an ion with the symbol X 2+ formed from a representative element. c. If X is in Period 3, what is the element?

Welcome back, everyone. We're told that our representative element forms an ion with the symbol A plus one. If A is in period four, we need to determine what the element would be. We're going to need to refer to our periodic tables. So I paste one on the screen and let's begin by recognizing that our group numbers ranging from one A to eight A on the periodic table as far as our S block and P block are consisting of the columns going down our periodic table. And let's recall that representative elements belong to the S and P blocks of our periodic table. Next, let's recall that period numbers which are the rows going across our periodic table will also be able to help us identify where our atom is located. Next note that our group number of our atom or where our atom is located will correspond to the number of valence electrons for that atom. Now, based on our given symbol A plus one in the subscript, the plus one exponent rather sorry, not subscript but exponent. The plus one exponent tells us that we have a loss of just one electron. And this means that we will form a plus one ion as an atom or as an ion. So with this understanding, we want to recall our group number that corresponds to forming plus one cats, beginning with group one A. We're going to recall that any element in this group will form a plus one cat ion, meaning it will lose one electron to have a stable configuration, which would make it like the atoms in group eight A with our noble gasses which have a full valence shell with eight electrons. Whereas our atoms in group two A will form ions or cat ions with a plus two charge. Next, in our P block, we have elements in group three A which will form ions with plus three charge. And then in group four A, we will have atoms which, which form ions with either a minus four charge. Then in group five A, we have atoms which will form a minus three charge for anions. And then in group six A, we have anions of minus two and in group seven, a anions of minus one, where on the other hand, a negative ion charge corresponds to an anion, meaning we gain that number of electrons. So right now, based on our given anion charge of plus one forming a plus one cat ion will correspond to group one A. And next, we focus on our given period number which is period four. So looking across period four and stopping at group one A, we would hit the atom with a chemical symbol being K. And so this means that our element is going to be capital K, which indicates the name potassium for that atom. And sorry, potassium is spelled with just one T. So we have potassium. So as a whole, we would have the chemical symbol K with a plus one ion charge. And ultimately, for a final answer, we were able to determine that our element is going to be potassium located in group one a and period four. So I hope that this made sense and let us know if you have any questions.

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1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
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3. Ionic Compounds

Periodic Table: Main Group Element Charges

GOB Chemistry

3. Ionic Compounds

Periodic Table: Main Group Element Charges

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Problem 111c

Textbook Question

Consider an ion with the symbol X²⁺ formed from a representative element.
c. If X is in Period 3, what is the element?

Verified step by step guidance

Identify the charge of the ion (X²⁺) and recognize that it indicates the element has lost 2 electrons.

Recall that representative elements are found in Groups 1A through 8A of the periodic table.

Determine which elements in Period 3 (the third row of the periodic table) are capable of forming a 2+ ion by losing two electrons. These elements are typically metals in Groups 2A or 3A.

Locate the elements in Period 3 and identify the one in Group 2A, as Group 2A elements commonly form 2+ ions. This element is magnesium (Mg).

Conclude that the element X in Period 3 that forms a X²⁺ ion is magnesium (Mg).

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Ion Formation

Ions are charged particles that form when atoms gain or lose electrons. A cation, like X²⁺, indicates that the atom has lost two electrons. Understanding how ions form is crucial for identifying elements based on their charge and electron configuration.

Periodic Table Trends

The periodic table organizes elements by increasing atomic number and groups them based on similar properties. Elements in the same period share the same number of electron shells. Recognizing the trends in periods and groups helps in identifying elements based on their position in the table.

Representative Elements

Representative elements, found in groups 1, 2, and 13-18 of the periodic table, exhibit a wide range of chemical and physical properties. These elements typically follow predictable patterns in their ionization and bonding behavior, making them essential for understanding the formation of ions like X²⁺.

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