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.
Usually, but not always.
molecular ions
A substance composed of more than one type of atom, chemically combined, is called a compound.
An element is composed of only one kind of atom. A compound is composed of atoms of more than one element.
If an atom is positively charged, it has lost one or more electrons and has more protons than electrons. This results in an overall positive charge due to the unbalanced positive charges from the protons.
A molecule is composed of one or more atoms that are properly bonded to each other. If a molecule contains more than one atom, each atom is then a partial molecule as opposed to a whole molecule. Therein lies the difference.
Sorry, don't understand your question. An atom is not in the nucleus, but an atom is composed of a nucleus and electrons surrounding it. What do you mean by metane? Please rethink question and resubmit
The majority of an atom's mass is found in its nucleus, which is located at the center of the atom. The nucleus is composed of protons and neutrons, which are much more massive than the electrons that orbit the nucleus.
The diatomic molecule of hydrogen is not considered a compound.
It would be an atom or a molecule (made up of more than one atoms)
if it is an object, than it is composed of matter. if it is a form of energy, then it is not concidered matter
In string theory a string is a one-dimensional object. It has length, but no width or height. It's hard to compare a one-dimensional object with a three-dimensional object like an atom in any meaningful way. About the best answer that can be given is that if it turns out that string theory or one of its variants is correct, atoms are composed of objects that are themselves made up of strings.