An atom's electrons are found in orbitals around the nucleus. The atomic number definition is based on the number of protons in an atom. Protons are positively charged particles in the nucleus of atoms. The atomic number is based solely on the number of protons in an atom. In contrast, ...
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Atomic number and mass number are always whole numbers because they are obtained by counting whole objects (protons, neutrons, and electrons). The sum of the mass number and the atomic number for an atom (A-Z) corresponds to the total number of subatomic particles present in the atom. The...
How changes in atomic mass leave clues to our climatological past. Dan Zak, Washington Post, 15 July 2019 Not only should the chemistry of the two isotopes be the same, the slight difference in atomic mass largely washes out in the watery environment of the body. Jennifer Ouellette, Quanta ...
Where do you find the atomic number of an element? What is the atomic number of hassium? Why is the periodic table arranged the way it is? What are the first 20 elements and their atomic numbers? What is the definition of atomic size in chemistry?
atomic weight- (chemistry) the mass of an atom of a chemical element expressed in atomic mass units atomic mass,relative atomic mass mass- the property of a body that causes it to have weight in a gravitational field combining weight,eq,equivalent weight,equivalent- the atomic weight of an ...
the atomic mass number and the atomic mass are either very close or else the same. In introductory chemistry, it's probably fine to consider them to mean the same thing. However, there are two cases in which the sum of the protons and neutrons (atomic mass number) is not quite the sam...
relative atomic mass - (chemistry) the mass of an atom of a chemical element expressed in atomic mass units atomic mass, atomic weight mass - the property of a body that causes it to have weight in a gravitational field combining weight, eq, equivalent weight, equivalent - the atomic weight...
The reason the atomic number determines the chemical properties of an element is that the number of protons also determines the number of electrons in an electrically neutral atom. This, in turn, defines the electron configuration of the atom and the nature of its outermost or valence shell. Th...
In chemistry, an atomic mass unit or AMU is a physical constant equal to one-twelfth of themassof an unboundatomofcarbon-12. It is a unit ofmassused to expressatomic massesandmolecular masses. When the mass is expressed in AMU, it roughly reflects the sum of the number of protons and n...