word "atom" is used for a single element
water is not an atom , it's a molecule which is made by the combination of atom when they reat with each other
The nucleus of an atom CANNOT itself contain atoms.
The number of protons can not be changed.
This atom is in an excited state.
A compound can contain a single atom of gold, but a single atom of gold alone, by itself, cannot be a compound.
Water has no helium (He) atom. Chemically water is H2O and there is no He atom present in water.
Sometimes, an atom cannot be split.
Atom
an "element" can be divided until it reaches a single atom. But a "molecule" can only be divided until it is a single molecule. For instance, water, H2O, is usually present in the millions to look like water. However, if you divide it up into smaller and smaller portions, say halves, you can only divide it until you have 2 Hydrogens and 1 Oxygen. If you divide it further, it is no longer water. It will become something else.
Atom
An atom is the smallest unit of matter that cannot be broken down into smaller particles without losing its unique properties. Each atom consists of a nucleus composed of protons and neutrons, surrounded by electrons in orbitals.
Water is made of two hydrogen atoms and an oxygen atom. The combination of hydrogen and oxygen is needed in order to create a molecule with the properties characteristic of water. Water cannot exist without oxygen.
atom
Are they blind?
Hydrophobic molecules do not dissolve in water. This is because water is hydrophilic. Another way to say this is that lipids, which are nonpolar, cannot dissolve in water, which in polar.
An example is what we call a salt - say solid crystalline sodium chloride - dissolved in water it becomes both types of ions: the sodium atom becomes a positively charged atom / ion while the chlorine atom becomes a negatively charged atom / ion.
You have 2 hydrogen and one oxygen atom, which is why water is H2O
The nucleus of an atom CANNOT itself contain atoms.