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Course: High school chemistry > Unit 3

Lesson 1: Representing chemical reactions
Science
High school chemistry
Chemical reactions
Representing chemical reactions
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Problem

When sodium (a highly reactive metal) combines with chlorine (a toxic gas) the atoms rearrange to form table salt.
Close-up image of a wooden spoon and salt crystals
Crystals of sodium chloride
The chemical equation for this reaction is shown below.
2Na(s)+ClA2(g)→2NaCl(s)
Use the chemical equation to complete the statements.
Sodium (Na) has a
of 2.
Chlorine (ClA2) has a
of 2.
Sodium chloride (NaCl) has a
of 2.