# Assignment 4 - Assignment 4 Due 11:59pm on Thursday You...

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Assignment 4 Due: 11:59pm on Thursday, September 15, 2016 You will receive no credit for items you complete after the assignment is due. Grading Policy Ions In chemical reactions, atoms often lose or gain electrons to form charged particles called ions . Positively charged ions are called cations , while negatively charged ions are called anions . Part A Complete the following chart. Drag each label to the appropriate target. Hint 1. How to approach the problem The number of protons in an atom, also called the atomic number, does not change when an atom loses or gains electrons to form an ion. Therefore, you can identify the element symbol of an ion or the number of protons in an ion by using the periodic table . A neutral atom contains the same number of protons and electrons. To determine the charge of an ion, you should consider the difference in the number of protons and the number of electrons: You can use the same relationship between ion charge, the number of protons, and the number of electrons to determine an unknown number of electrons when the ion charge and the number of protons is known. Hint 2. Determine the ion charge for an example ion What is the charge of an ion that has 16 protons and 18 electrons? Express the charge numerically (e.g., +1 ). Hint 1. How to determine the ion charge The charge of an ion can be determined using the equation given here: ANSWER: Correct Hint 3. Determine the number of electrons for an example ion If an ion has 11 protons and a charge of +1, how many electrons does the ion contain? Express your answer numerically as an integer. Hint 1. How to determine the number of electrons You can use the relationship given here to determine the number of electrons the ion contains. ANSWER: Correct Hint 4. Determine the number of protons for an example ion How many protons does a ion contain? Express your answer numerically as an integer. Hint 1. How to determine the number of protons Each element has a unique atomic number, which is equal to the number of protons in the nucleus of an atom. The periodic table of elements is arranged by the atomic number of the elements. ion charge = number of protons number of electrons ion charge = number of protons number of electrons -2 ion charge = number of protons number of electrons 10 F
For a given element, look above the symbol in the periodic table to find the atomic number. For example, carbon has an atomic number of 6.