Multiple Choice
How many naturally occurring elements are found on the periodic table?
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2. Atoms & Elements
Periodic Table: Element Symbols
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In the following diagram, the element with atomic number 8 is represented by a question mark. Which element's symbol should replace the question mark?
A
F
B
N
C
C
D
O
Verified step by step guidance1
Identify the element with atomic number 8 by referring to the periodic table. The atomic number corresponds to the number of protons in the nucleus of an atom.
Recall that the atomic number 8 corresponds to the element oxygen, which has the symbol 'O'.
Examine the given elements in the diagram: F (fluorine), N (nitrogen), and C (carbon), and note their atomic numbers: F is 9, N is 7, and C is 6.
Since the question mark represents the element with atomic number 8, it should be placed between nitrogen (7) and fluorine (9) in the periodic table sequence.
Conclude that the symbol 'O' for oxygen correctly replaces the question mark, as oxygen has atomic number 8.
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