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9/7/2014 ALEKS Alex H. Yuan - 09/07/2014 10:14:32 PM EDT - Copyright © 2014 UC Regents and ALEKS Corporation Alex H. Yuan - 09/07/2014 10:14:32 PM EDT General Chemistry (First Semester) / Chem 110 FA 2014 – CH110 FA14 S25-36 (Dr. Barber) 1. Counting the electron shells in a neutral atom Fill in the missing information about the atoms in the table below. symbol number of protons number of electrons total valence number of electron shells You can answer this question by using the Periodic Table. Where you find an element in the Periodic Table tells you a lot about what's inside atoms of that element: The atomic number of an element tells you the number of protons and electrons in a neutral atom of the element. For example, the element chlorine (symbol ) has atomic number That tells you there are protons and electrons in a neutral atom of chlorine. The group in which you find an element tells you the number of valence electrons in a neutral atom of the element. For example, you'll find chlorine in Group That means a neutral atom of chlorine has valence electrons. Oxygen is in Group That means a neutral atom of oxygen has valence electrons. The period in which you find an element tells you the number of electron shells in a neutral atom of the element. For example, chlorine is in Period That means a neutral atom of chlorine has electron shells. Oxygen is in Period atom of oxygen has electron shells. so a neutral Now let's apply these general principles to the specific problem you've got: The atomic number of rubidium (symbol ) is so there are protons and electrons in a neutral atom. Also, rubidium is in Group so there is valence https://secure.aleks.com/alekscgi/x/Isl.exe/1o_u-IgNsIkr7j8P3jH-lJiYsPgPQIfQokR4hWMNIe-wKsFh3XosS7UdbJJbec5v-bErzeXkMW4CvqF-zDdQSH… 1/2 9/7/2014 ALEKS Alex H. Yuan - 09/07/2014 10:14:32 PM EDT - Copyright © 2014 UC Regents and ALEKS Corporation electron in a neutral of electrons in a neutral atom. Finally, rubidium is in Period so there are shells atom. The atomic number of potassium (symbol ) is so there are electrons in a neutral atom. Also, potassium is in Group electron in a neutral atom. Finally, potassium is in Period of electrons in a neutral atom. protons and so there is so there are valence shells The atomic number of lithium (symbol ) is so there are protons and electrons in a neutral atom. Also, lithium is in Group so there is valence electron in a neutral atom. Finally, lithium is in Period so there are shells of electrons in a neutral atom. Since all three atoms in this problem are from the same group, they have the same number of valence electrons. However, since they are from different periods, they have different numbers of electron shells. Here is the completed table: symbol number of protons number of electrons total valence number of electron shells Copyright © 2014 UC Regents and ALEKS Corporation https://secure.aleks.com/alekscgi/x/Isl.exe/1o_u-IgNsIkr7j8P3jH-lJiYsPgPQIfQokR4hWMNIe-wKsFh3XosS7UdbJJbec5v-bErzeXkMW4CvqF-zDdQSH… 2/2