Question at position 4 What is the basic unit of a chemical element that retains the properties of that element?MoleculeCompoundIonAtom单项选择题
A
Molecule
B
Compound
C
Ion
D
Atom

Question

Question at position 4 What is the basic unit of a chemical element that retains the properties of that element?MoleculeCompoundIonAtom

BlackTom AI · Accepted Answer

The question asks for the basic unit of a chemical element that retains the properties of that element, along with four possible choices.
Option 1: Molecule. A molecule is a group of two or more atoms bonded together. While molecules can represent substances, they are not the fundamental unit of an element, and a molecule may consist of the same element or different elements. This makes it incorrect as the basic unit that preserves elemental properties.
Option 2: Compound. A compound is a substance composed of two or more different elements chemically bonded in fixed proportions. Compounds are built from elements, but they are not the basic unit of an element itself, so this choice does not fit the idea of the smallest unit that retains elemental properties.
Option 3: Ion. An ion is an atom or molecule that has gained or lost electrons, giving it a net charge. While ions involve atoms, the fact that an ion is charged means it is a changed state rather than the fundamental unit that inherently retains the properties of the element. This makes it an incorrect descriptor for the basic unit of the element.
Option 4: Atom. An atom is the smallest unit of an element that retains the distinct chemical properties of that element. Atoms are the fundamental building blocks from which elements are composed, and they maintain the characteristics (such as electron arrangement and chemical behavior) of the element they represent. This aligns precisely with the definition in the question.

Question at position 4 What is the basic unit of a chemical element that retains the properties of that element?MoleculeCompoundIonAtom单项选择题

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