Question

a student studies two different atom arrangements.
arrangement 1 arrangement 2
two boxes with atom/molecule diagrams: arrangement 1 has single dark atoms, arrangement 2 has light molecules (two atoms each)
how can the student classify arrangements 1 and 2?

☐ arrangements 1 and 2 are compounds; compounds are composed of different types of atoms.

☐ arrangement 1 is an element, and arrangement 2 is a mixture; an element is made of one atom, and a mixture is made of more than one atom.

☐ arrangement 1 is an element, and arrangement 2 is a compound; an element is made of one atom, and a compound is made of one molecule.

☐ arrangements 1 and 2 are elements; elements are made of atoms or molecules composed of the same kind of atoms.

Explanation:

1. Analyze Arrangement 1: It has only one type of atom (all black atoms are the same), so it's an element (elements are made of the same kind of atoms, either as single atoms or molecules of the same atom).
2. Analyze Arrangement 2: It has molecules made of the same type of atom (all the molecules have the same kind of light - colored atoms), so it's also an element (since elements can be made of molecules composed of the same kind of atoms, like diatomic elements).
3. Evaluate other options:

• First option: Arrangements 1 and 2 are not compounds because compounds need different types of atoms. So this is wrong.
• Second option: Arrangement 2 is not a mixture. A mixture has different types of substances, and Arrangement 2 has molecules of the same atom. Also, the definition of element and mixture here is incorrect. So this is wrong.
• Third option: Arrangement 2 is not a compound as it has only one type of atom in its molecules. So this is wrong.
• Fourth option: Both arrangements have atoms or molecules of the same kind of atom, so they are elements. This matches the definition of an element.

Answer:

Arrangements 1 and 2 are elements; elements are made of atoms or molecules composed of the same kind of atoms.