if u mean the atomic number of a chemical element it is the number of electrons and protons it has the other number is the number of neutrons e.g ununoctium number 118 is the atomic number the other number i think is 7
The atomic number is the number of protons, so 15.
The atomic number is based on the number of protons in an atom, which determines its chemical properties. In this case, the atom has 40 protons, so its atomic number is 40, which corresponds to the element zirconium (Zr) on the periodic table.
An element is a unique substance composed of atoms with the same atomic number, meaning they have the same number of protons in their nucleus. Each element is distinguished by its atomic number, which determines its position on the periodic table and its chemical properties.
The atomic number by definition is the number of protons in the nucleus, therefore 19 in this instance. (The isotope effectively specified by the numbers given in the question is potassium-40, which is least commonly occurring natural isotope of potassium.)
the answer is that it is called a atomic number.
The atomic number for any isotope of fluorine is always 9; that is the "definition" of fluorine.
Atomicity is having atoms. Also the number of atoms in a molecule.
The number of protons in an atom of any atomic number is the same as the atomic number, because that is the definition of atomic number. Therefore, in the given question, the answer is 34; the mass number is not needed to answer.
This is the definition of an "isotope".
Identically the same, by definition.
By definition, the number of protons in the atoms of an element is the atomic number of the element.
The elements with the highest atomic numbers have the greatest numbers of protons in their nucleus, because that is the definition of atomic number.
Transmutation by definition means the conversion of one element into another, and so it follows that its atomic number must also change. Every element has a unique atomic number.
The atomic number is the number of protons, so 15.
It is the number equal to the number of protons in the nucleus of an atom.the number of electron or proton present in anyatom is called "atomic number/Charge number" of that atom it is denoted by Z.For Example.atomic number of Na is 11. Atomic number of Ca is20by:Kapil Kumar.V.Anandani......
Fluorine has 9 protons per atom: The number of protons per atom is by definition the atomic number of an element, and reference to a Periodic Table shows that the atomic number of fluorine is 9.
Firstly, an atom is uncharged by definition. If it is charged, that is it has gained or lost electrons, its name is changed to an ion. The atomic number is the number of protons of an atom of that element. And the number of protons is equal to the number of electrons.