Question

combines with chlorine (a toxic gas) the atoms rearrange to form table salt.
crystals of sodium chloride
the chemical equation for this reaction is shown below.
\\(\ce{2na(s) + cl_{2}(g) \
ightarrow 2nacl(s)}\\)
use the chemical equation to complete the statements.

• sodium (\\(\ce{na}\\)) has a \\(\boldsymbol{\downarrow}\\) of 2.
• chlorine (\\(\ce{cl_{2}}\\)) has a \\(\boldsymbol{\downarrow}\\) of 2.
• sodium chloride (\\(\ce{nacl}\\)) has a \\(\boldsymbol{\downarrow}\\) of 2.

Explanation:

Step1: Analyze Sodium (Na)

In the chemical equation \( 2\text{Na}(s) + \text{Cl}_2(g) ightarrow 2\text{NaCl}(s) \), the number in front of Na is 2. This number is called the coefficient, which represents the number of moles (or molecules/atoms in terms of stoichiometry) of the substance. So Sodium (Na) has a coefficient of 2.

Step2: Analyze Chlorine (\( \text{Cl}_2 \))

For \( \text{Cl}_2 \), the subscript of Cl is 2, but wait, no—wait, the coefficient in front of \( \text{Cl}_2 \) is 1 (since there's no number, it's 1), but the question is about the "of 2" part. Wait, no, looking at the equation: \( 2\text{Na} \) (coefficient 2), \( \text{Cl}_2 \) has a subscript? No, \( \text{Cl}_2 \) is a diatomic molecule, so the subscript 2 means there are 2 Cl atoms per molecule. But in terms of the coefficient for the substance \( \text{Cl}_2 \), it's 1. Wait, no, the question is about the "of 2"—wait, maybe the first blank for Na: coefficient. Then for \( \text{Cl}_2 \), maybe the subscript? No, wait, the equation: \( 2\text{Na} \) (coefficient 2), \( \text{Cl}_2 \) (molecule with 2 atoms, so subscript 2? No, subscript is for atoms in a molecule. Wait, maybe the question is about the coefficient (for the substance) or the number of atoms/molecules. Wait, let's re-express:

- For \( 2\text{Na} \): the coefficient is 2, meaning 2 moles (or atoms) of Na.
- For \( \text{Cl}_2 \): the subscript 2 means 2 atoms of Cl per molecule of \( \text{Cl}_2 \), but the coefficient of \( \text{Cl}_2 \) is 1. Wait, no, maybe the question is using "of 2" to refer to:

Wait, the three blanks:

1. Sodium (Na) has a **coefficient** of 2 (since the number in front is 2).
2. Chlorine (\( \text{Cl}_2 \)) has a **subscript**? No, \( \text{Cl}_2 \) has a subscript of 2 (atoms per molecule), but the coefficient of \( \text{Cl}_2 \) is 1. Wait, maybe the question is about the number of atoms/molecules:

Wait, no, let's check the equation again:

\( 2\text{Na}(s) \): 2 atoms (or moles) of Na.

\( \text{Cl}_2(g) \): 1 molecule of \( \text{Cl}_2 \), which contains 2 atoms of Cl.

\( 2\text{NaCl}(s) \): 2 formula units of NaCl, each containing 1 Na and 1 Cl.

So the first blank (Na): coefficient (2).

Second blank (Cl₂): maybe the number of atoms per molecule (subscript 2), but the coefficient of Cl₂ is 1. Wait, maybe the question is using "of 2" as:

- Sodium (Na): coefficient (2)
- Chlorine (Cl₂): number of atoms (2 per molecule)
- Sodium chloride (NaCl): coefficient (2)

Yes, that makes sense. So:

- Sodium (Na) has a **coefficient** of 2 (since 2 Na atoms/moles).
- Chlorine (Cl₂) has a **subscript** of 2 (2 Cl atoms per Cl₂ molecule), but wait, the coefficient of Cl₂ is 1. Wait, maybe the question is simplified:

In the equation, the number in front (coefficient) for Na is 2, for Cl₂ is 1, but the Cl₂ molecule has 2 Cl atoms (subscript 2), and for NaCl, the coefficient is 2.

So:

1. Sodium (Na) has a **coefficient** of 2.
2. Chlorine (Cl₂) has a **subscript** of 2 (number of Cl atoms per Cl₂ molecule).
3. Sodium chloride (NaCl) has a **coefficient** of 2.

But maybe the question is using "of 2" to refer to:

- Coefficient (for the substance) or the number of atoms in the molecule/formula.

So to fill the blanks:

- Sodium (Na): coefficient (2)
- Chlorine (Cl₂): subscript (2, atoms per molecule)
- Sodium chloride (NaCl): coefficient (2)

But let's confirm:

- Coefficient: number in front of the chemical formula (for the substance).
- Subscript: number within the chemical formula (for atoms in a molecule or ions in a formula unit).

So:

- \( 2\text{Na} \): coefficient 2 (for Na atoms).
- \( \text{Cl}_2 \): subscript 2 (for Cl atoms in the \( \text{Cl}_2 \) molecule).
- \( 2\text{NaCl} \): coefficient 2 (for NaCl formula units).

So the answers would be:

- Sodium (Na) has a **coefficient** of 2.
- Chlorine (Cl₂) has a **subscript** of 2 (or "number of atoms" but subscript is the term).
- Sodium chloride (NaCl) has a **coefficient** of 2.

But maybe the question is using "of 2" to mean:

1. Coefficient (for Na: 2)
2. Number of atoms (for Cl₂: 2 atoms per molecule)
3. Coefficient (for NaCl: 2)

So filling the blanks:

- Sodium (Na): coefficient
- Chlorine (Cl₂): subscript (or "number of atoms")
- Sodium chloride (NaCl): coefficient

But since the question is to complete the statements with the appropriate term (like coefficient, subscript, etc.), but maybe the options are "coefficient", "subscript", or similar. Assuming the blanks are dropdowns with options like "coefficient", "subscript", "number of atoms", etc.

So:

1. Sodium (Na) has a **coefficient** of 2 (because the number in front is 2).
2. Chlorine (Cl₂) has a **subscript** of 2? No, \( \text{Cl}_2 \) has a subscript of 2 (atoms per molecule), but the coefficient of \( \text{Cl}_2 \) is 1. Wait, maybe the question is wrong, but based on the equation:

- \( 2\text{Na} \): coefficient 2.
- \( \text{Cl}_2 \): the molecule has 2 atoms, so "number of atoms" is 2.
- \( 2\text{NaCl} \): coefficient 2.

So the answers are:

- Sodium (Na): coefficient
- Chlorine (Cl₂): number of atoms (or subscript, but subscript is in the formula)
- Sodium chloride (NaCl): coefficient

But likely, the intended answers are:

1. Coefficient (for Na: 2)
2. Subscript (for Cl₂: 2 atoms per molecule, so subscript 2 in \( \text{Cl}_2 \))
3. Coefficient (for NaCl: 2)

So summarizing:

- Sodium (Na) has a coefficient of 2.
- Chlorine (Cl₂) has a subscript of 2 (or number of atoms, but subscript is the term in the formula).
- Sodium chloride (NaCl) has a coefficient of 2.

Answer:

• Sodium (Na) has a \(\boldsymbol{\text{coefficient}}\) of 2.
• Chlorine (\(\text{Cl}_2\)) has a \(\boldsymbol{\text{subscript}}\) of 2 (or "number of atoms" depending on context, but subscript is the formula term).
• Sodium chloride (NaCl) has a \(\boldsymbol{\text{coefficient}}\) of 2.

(Note: If the dropdown options are "coefficient", "subscript", "number of atoms", etc., the first and third are "coefficient", the second is "subscript" or "number of atoms" for \(\text{Cl}_2\) having 2 atoms per molecule.)