We use atomic number for recognize chemical elements. atomic number means, how many protons are there in a single atom.
The atomic number for Hydrogen is 1 (one). Hydrogen atoms have one proton and one electron.
An atomic number is actually related to an element and not an atom. Therefore, the question is not relevant. It is NOT atoms that have an atomic number; it is the element.
The number of protons in the nuclei of their atoms. This is the atomic number of an element and each element has its own unique atomic number.
atomic number
The atomic number is the number of protons in nuclei of the atoms of a given element.
There is not one: only single atoms or elements have atomic numbers.
NH3 is a compound, not an element. It does not have an atomic number. If you mean the number of atoms in the molecule the answer is 4: 1 nitrogen and 3 hydrogen. This is not the same as atomic number.
If you mean "how does one determine an atoms atomic mass?", then the answer would be to find a periodic table of elements where the whole numbers indicate atomic number and the other indicating atomic mass. Atomic number is generally described as the number of protons in a naturally occurring atom of a given element, and the atomic mass is the number of protons + number of neutrons in an atom.
The number of protons in the nucleus of an atom determines an element's atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of that element. For example, all hydrogen atoms, and only hydrogen atoms, contain one proton and have an atomic number of 1. All carbon atoms, and only carbon atoms, contain six protons and have an atomic number of 6. Oxygen atoms contain 8 protons and have an atomic number of 8. The atomic number of an element never changes, meaning that the number of protons in the nucleus of every atom in an element is always the same.
how do you find the atomic number for an element?
The atomic number is equal to the number of protons.
A pure substance in which all the atoms have the same atomic number or number of protons is an element.