Multiple Choice
Which of the following is a representative element, found in the 3rd Period, that is also a pnictogen.
2. Atoms and the Periodic Table
Periodic Table: Representative Elements & Transition Metals
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State the element symbol found in the 6th Period and Group 7A.
A
Rb
B
W
C
Br
D
Kr
E
At
Verified step by step guidance1
Identify the location of the element in the periodic table by understanding the period and group notation. The 6th Period refers to the horizontal row number 6, and Group 7A refers to the vertical column in the main group elements, also known as Group 17 in the IUPAC system.
Recall that Group 7A elements are known as halogens. These elements typically have seven valence electrons and are located in the second-to-last column of the periodic table.
List the elements in Group 7A (halogens) in order of increasing atomic number: F (Fluorine), Cl (Chlorine), Br (Bromine), I (Iodine), and At (Astatine).
Determine which of these elements is located in the 6th Period. The 6th Period is the row that starts with Cesium (Cs) and ends with Radon (Rn).
Identify that Astatine (At) is the element in Group 7A that is found in the 6th Period, as it follows Iodine (I) in the periodic table.
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