Usually, but not always.
An element is composed of only one kind of atom. A compound is composed of atoms of more than one element.
No an element is composed of 1 type of atom but a compound is composed of 1 or more atoms
Carbon is an element and not a compound. It is made up of one kind of atom, which is carbon. A compound is composed of two or more elements.
No. Atoms are the building blocks of matter. Each element is composed of the same kind of atoms, according to their number of protons (atomic number). Molecules are composed of two or more atoms (they may be the same element or different elements), and compounds are composed of two or more kinds of atoms.
A mixture is a substance composed of two or more components physically combined. An element is a pure substance composed of one kind of atom. A compound is a pure substance formed when atoms of two or more elements chemically combine.
molecular ions
Every object you see is composed of more than one atom. You can not see the largest atom with naked eye. In fact you may have to spend years to count the atoms in the smallest object that you can see.
A substance composed of more than one type of atom, chemically combined, is called a compound.
Molecules are composed of one or more atoms. You have it backward in your question.
Oxygen is an element. This means that it is composed of only one kind of atom, and it takes two atoms of oxygen to make one molecule of oxygen. A compound is composed of more than one kind of element. A simple example is carbon dioxide which is composed of one atom of carbon and two atoms of oxygen. A mixture is composed of more than one kind of compound.
mixture
The answer to this question depends on the unstated definition of "kind of atom". All atoms of one element have the same atomic number, which equals the number of protons in nuclei of the atoms. However, atoms of the same element may have different masses because of different number of neutrons in their nuclei.