Texas Cosmetology Operator Written ExamChemistryEasy
A cosmetology student is learning about the basic building blocks of matter. Which of the following accurately describes the smallest unit of an element that retains the chemical identity of that element?
- AMolecule
- BProton
- CCompound
- DAtom
Show answer & explanationAnswer & explanation
Correct answer: D. Atom
An atom is the fundamental unit of an element, and it maintains the chemical properties of that element. Molecules are combinations of atoms, and compounds are specific types of molecules.
Why the other options are wrong
- A. A molecule is formed when two or more atoms are chemically bonded together.
- B. A proton is a subatomic particle found within the nucleus of an atom, not the atom itself.
- C. A compound is a substance formed when two or more different elements are chemically bonded together.
Atom
The smallest unit of an element that retains the chemical identity of that element, consisting of a nucleus surrounded by electrons.
- Building block of all matter
- Composed of protons, neutrons, and electrons
- Defines the element's chemical properties
Memory trick: An Atom's Identity is Key.