Multiple Choice
Which of the following lists contains the eight most abundant elements in Earth's crust?
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2. Atoms & Elements
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 periodic table structure: The periodic table is organized into periods (horizontal rows) and groups (vertical columns). Periods are numbered from 1 to 7, and groups are numbered from 1 to 18, with Group 7A also known as Group 17 in the modern IUPAC system.
Locate the 6th period: The 6th period is the second-to-last row of the periodic table, containing elements with atomic numbers from 55 (Cesium, Cs) to 86 (Radon, Rn).
Identify Group 7A (or Group 17): This group is known as the halogens, which includes elements like Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).
Find the intersection of the 6th period and Group 7A: In the 6th period, the element in Group 7A is Astatine (At).
Verify the element symbol: Ensure that the element symbol 'At' corresponds to Astatine, which is indeed the element found in the 6th period and Group 7A.
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