Multiple Choice
Which of the following lists contains the five most common elements found in the human body?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which of the following elements is found in period 3 of the periodic table?
A
Na
B
K
C
Fe
D
Mg
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 in the options: Na (Sodium), K (Potassium), Fe (Iron), and Mg (Magnesium).
Recall the position of each element in the periodic table: Na and Mg are in period 3, K is in period 4, and Fe is in period 4 or 8 depending on counting but generally in period 4 (transition metals).
Confirm that period 3 elements include Na and Mg, but since the question asks for one element, focus on the given correct answer Na.
Conclude that Na (Sodium) is an element found in period 3 of the periodic table.
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