Multiple Choice
Which of the following is the correct formula for the ionic compound formed from barium and phosphorus?
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3. Chemical Reactions
Naming Ionic Compounds
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In the chemical formula for table salt, NaCl, how many atoms of sodium (Na) are present in one formula unit?
A
0
B
4
C
1
D
2
Verified step by step guidance1
Understand that a chemical formula represents the ratio of atoms of each element in one formula unit of a compound.
Look at the formula NaCl, which consists of one sodium (Na) atom and one chlorine (Cl) atom per formula unit.
Recognize that the subscript numbers in a chemical formula indicate the number of atoms of each element; if no subscript is present, it means there is exactly one atom of that element.
Since Na has no subscript in NaCl, it means there is one sodium atom in one formula unit of table salt.
Therefore, the number of sodium atoms in one formula unit of NaCl is 1.
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