The atomic number defines an atom's identity, i.e. element. A group of atoms contatining the same number of protons in their nuclei belong to the same element even if they can have different numbers of neutrons or electrons associated with them. If two atoms have the same number of protons but different number of neutrons, they are called isotopes. If an atom has less or more electrons than its number of protons, it is known as an ion. In certain instances during radioactive decay, the number of protons in an atom's nucleus can actually change. This results in a transmutation (change of one element to another).
The atomic number serves as the unique identification of a chemical element. It is the number of protons found in the nucleus of an atom which is also equal to the charge of the nucleus.
I think is Protons
The smallest subdivision that retains all of the properties of a molecular compound is a molecule, and the smallest subdivision that retains all of the properties of a ionic compound is a formula unit.
an atom is the basic unit of a chemical element.
A single atom of an element is represented by that element's chemical symbol.
If you know how many protons the atom has, then that can tell you what element from the periodic table is classifying the atom.
Chemical formulas represent the number and element of each type of atom in a molecule.
An isotope is an atom that contains a different number of neutrons. In order for an element to change there has to be a different number of protons.
the smallest particle of an element that maintains its chemical identity through all chemical and physical changes is called an atom
Protons determine which element an atom is.
An atom is the smallest particle of an element that can be uniquely identified as that specific element.Note that this question is different from asking "What is the smallest particle in an atom?" (see related question below). Atoms are composed of smaller particles (protons, electrons, and neutrons), but the smallest thing that has the identity of a specific element is the atom.The smallest particle of an element that still retains all that element's properties is called an ATOM.
The number of protons in an atom's nucleus determines its chemical identity.
The smallest subdivision that retains all of the properties of a molecular compound is a molecule, and the smallest subdivision that retains all of the properties of a ionic compound is a formula unit.
An atom is the smallest part of matter with a chemical identity, impossible to be broken by chemical procedures.
The number of protons in the nucleus of an atom will determine its chemical identity. Only that. The number of neutrons can vary a bit, depending on the element, and we call these variations isotopes of that element. Electron count will match proton count only in a neutral atom. Rememeber that atoms loan out and borrow electrons, which is what chemistry is all about.
an atom is the basic unit of a chemical element.
retains the chemical identity of that element.
An ATOM!!!! An atom can be sub-divided in to protons, neutrons, and electrons.
The number of protons in the nucleus affects the elemental identity of an atom, whereas the number of neutrons does not affect which element an atom belongs to.