Textbook Question
Juan added the following elements to the soil to improve potato production. Identify the group and period for and classify each as an alkali metal, an alkaline earth metal, a transition element, or a nonmetal:
b. Cu
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2. Atoms and the Periodic Table
Periodic Table: Group Names
1:31 minutesProblem 5
Textbook Question
Locate aluminum in the periodic table and give its group number and period number.
Verified step by step guidance1
Locate aluminum (Al) on the periodic table. Aluminum has the atomic number 13, which helps you find its position.
Identify the group number: Groups in the periodic table are the vertical columns. Aluminum is in Group 13 (or Group IIIA in older notation).
Identify the period number: Periods in the periodic table are the horizontal rows. Aluminum is in Period 3.
Understand the significance: The group number indicates the number of valence electrons in aluminum (3 valence electrons), and the period number indicates the number of electron shells (3 shells).
Summarize: Aluminum is located in Group 13 and Period 3 of the periodic table.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Periodic Table
The periodic table is a systematic arrangement of chemical elements, organized by increasing atomic number. Elements are grouped into rows called periods and columns known as groups, which reflect their similar properties. Understanding the layout of the periodic table is essential for identifying the characteristics of elements, including their reactivity and bonding behavior.
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Group Number
The group number in the periodic table indicates the number of valence electrons in the outer shell of an element. Elements within the same group exhibit similar chemical properties due to this shared electron configuration. For example, aluminum is located in Group 13, which signifies it has three valence electrons, influencing its reactivity and bonding patterns.
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Period Number
The period number represents the horizontal row in which an element is found on the periodic table, corresponding to the highest energy level of electrons in an atom. As you move across a period from left to right, the atomic number increases, and elements typically transition from metals to nonmetals. Aluminum is located in Period 3, indicating it has three electron shells.
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