Multiple Choice
Which element has a molar mass of 30.974 g/mol?
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2. Atoms & Elements
Periodic Table: Element Symbols
Multiple Choice
Which of the following pairs correctly matches an element with its chemical symbol?
A
Sodium — Na
B
Potassium — P
C
Carbon — Ca
D
Iron — Ir
Verified step by step guidance1
Step 1: Understand that each chemical element has a unique one- or two-letter chemical symbol derived from its English or Latin name.
Step 2: Recall or look up the correct chemical symbols for the elements given: Sodium, Potassium, Carbon, and Iron.
Step 3: Verify Sodium's symbol is 'Na', which comes from its Latin name 'Natrium'.
Step 4: Check Potassium's symbol, which is 'K' (from Latin 'Kalium'), not 'P'. The symbol 'P' belongs to Phosphorus.
Step 5: Confirm Carbon's symbol is 'C', not 'Ca'. 'Ca' is the symbol for Calcium. Also, Iron's symbol is 'Fe' (from Latin 'Ferrum'), not 'Ir' which is for Iridium.
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