Question

part a
two sodium atoms for every oxygen atom
express your answer as a chemical formula.
a chemical reaction does not occur for this question
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part b
one arsenic atom for every three bromine atoms
express your answer as a chemical formula.
a chemical reaction does not occur for this question
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part c
one arsenic atom for every five chlorine atoms
express your answer as a chemical formula.

Explanation:

Part A

Step1: Determine the chemical symbols

Sodium is \(Na\) and oxygen is \(O\).

Step2: Use the ratio to write the formula

Given two sodium atoms for every oxygen atom. In ionic compounds, the formula is written with the cation (sodium, \(Na^{+}\)) first and the anion (oxide, \(O^{2 -}\)) second. Using the criss - cross method (where we take the absolute value of the charge of one ion as the subscript of the other ion), for \(Na^{+}\) and \(O^{2-}\), the formula is \(Na_{2}O\).

Part B

Step1: Determine the chemical symbols

Arsenic is \(As\) and bromine is \(Br\).

Step2: Use the ratio to write the formula

Given one arsenic atom for every three bromine atoms. Since it is a covalent compound (between two non - metals), the formula is written as \(AsBr_{3}\) (using the ratio of atoms directly as subscripts).

Part C

Step1: Determine the chemical symbols

Arsenic is \(As\) and chlorine is \(Cl\).

Step2: Use the ratio to write the formula

Given one arsenic atom for every five chlorine atoms. Since it is a covalent compound (between two non - metals), the formula is written as \(AsCl_{5}\) (using the ratio of atoms directly as subscripts).

Answer:

Part A: \(Na_{2}O\)
Part B: \(AsBr_{3}\)
Part C: \(AsCl_{5}\)