Definition of atomic mass and atomic number?

Answer 1

the atomic number: 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.

the Atomic Mass: it's the sum of neutrons and protons electrons in a single atom.

to sum it up the atomic number is the number of protons and the mass number is the total number of every thing in an atom!

Answer 2

The atomic number is the number of a chemical element in the Periodic Table of Mendeleev; it is equal to the number of protons and electrons.

The atomic mass is the mass of an isotope atom expressed in 1/12 from the atomic mass of the isotope 12C (atomic mass unit).

Answer 3

Atomic number is the number of protons in the nucleus of an atom of a given element. Each element has its own unique atomic number. The number of protons defines an element. On the periodic table, the elements are arranged in increasing order of atomic number. Atomic mass is the mass of all of the electrons, protons, and neutrons in a given isotope of an atom and is expressed in atomic mass units, amu .

Answer 4

Atomic mass is the average mass of an atom of an element, taking into account the relative abundance of each isotope. Atomic number is the number of protons in the nucleus of an atom, which determines the element's identity on the periodic table.