Multiple Choice
Which element has 4 protons in its nucleus?
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4. Atoms and Elements
Periodic Table: Element Symbols
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Which of the following is a valid two-letter element symbol from the periodic table?
A
N
B
Na
C
Naa
D
NA
Verified step by step guidance1
Understand that element symbols on the periodic table consist of either one or two letters. The first letter is always uppercase, and if there is a second letter, it is always lowercase.
Look at each option and check if it follows the capitalization rule: the first letter uppercase and the second letter lowercase (if present).
Check if the symbol corresponds to an actual element on the periodic table. For example, 'Na' is the symbol for Sodium.
Eliminate options that do not follow the capitalization rule or do not correspond to any element symbol, such as 'Naa' (three letters) or 'NA' (both uppercase).
Conclude that the valid two-letter element symbol from the given options is the one that follows the rules and matches an element on the periodic table.
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