Multiple Choice
Which lanthanide element has the lowest atomic mass?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which of the following is a main-group element in period 3 of the periodic table?
A
Fe
B
Zn
C
Cu
D
Na
Verified step by step guidance1
Understand that the periodic table is organized into periods (rows) and groups (columns). Period 3 refers to the third row of the periodic table.
Identify what 'main-group elements' means: these are elements in groups 1, 2, and 13 through 18, which include the s- and p-block elements, excluding transition metals.
Locate each element given in the problem on the periodic table: Fe (iron), Zn (zinc), Cu (copper), and Na (sodium).
Check the period (row) of each element: Fe, Zn, and Cu are transition metals located in period 4, while Na is an alkali metal located in period 3.
Since Na is in period 3 and belongs to the main group (group 1), it is the correct answer as the main-group element in period 3.
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