Multiple Choice
Which element is the most abundant in Earth’s crust by mass?
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4. Atoms and Elements
Periodic Table: Element Symbols
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Which element has 13 protons (i.e., atomic number )?
A
Silicon (Si)
B
Aluminum (Al)
C
Magnesium (Mg)
D
Phosphorus (P)
Verified step by step guidance1
Recall that the atomic number of an element is equal to the number of protons in its nucleus.
Identify the atomic numbers of the given elements: Silicon (Si), Aluminum (Al), Magnesium (Mg), and Phosphorus (P).
Use the periodic table to find the atomic number for each element: Silicon has atomic number 14, Aluminum has atomic number 13, Magnesium has atomic number 12, and Phosphorus has atomic number 15.
Compare the atomic numbers to the given number of protons, which is 13.
Conclude that the element with 13 protons (atomic number 13) is Aluminum (Al).
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