Multiple Choice
An element has 25 electrons (i.e., atomic number ). Which classification best describes this element in the periodic table?
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4. Atoms and Elements
Periodic Table: Representative Elements & Transition Metals
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Which of the following is a main-group (representative) element in period 3 of the periodic table?
A
K
B
Br
C
Fe
D
S
Verified step by step guidance1
Understand that the periodic table is arranged in periods (rows) and groups (columns). Period 3 refers to the third row of the periodic table.
Identify the elements listed and their positions: K (potassium) is in period 4, Br (bromine) is in period 4, Fe (iron) is in period 4, and S (sulfur) is in period 3.
Recall that main-group (representative) elements are found in groups 1, 2, and 13 through 18, which include s- and p-block elements, excluding transition metals.
Determine which of the given elements belong to the main-group elements in period 3 by checking their group and period positions.
Conclude that sulfur (S) is a main-group element located in period 3, as it is in group 16 (a p-block group) and period 3.
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