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Sodium element atomic number12/23/2023 Therefore, there are various non-equivalent definitions of atomic radius. However, this assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. The Mass Number describes the total number of protons and neutrons in the nucleus. The atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. The number of protons in an atom is known as the Atomic Number, which is how the periodic table is organized (they are listed in order of atomic number from left to right). It must be noted, atoms lack a well-defined outer boundary. The atomic radius of Sodium atom is 166pm (covalent radius). Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. The atomic mass is carried by the atomic nucleus, which occupies only about 10 -12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. Sodium Atomic Number: 11 Atomic Weight: 22.98976928 Melting Point: 370.95 K (97.80C or 208.04F) Boiling Point: 1156 K (883C or 1621F) Density: 0.97. Mass numbers of typical isotopes of Sodium are 23. Isotopes are nuclides that have the same atomic number and are therefore the same element, but differ in the number of neutrons. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z.įor stable elements, there is usually a variety of stable isotopes. Neutron number plus atomic number equals atomic mass number: N+Z=A. 23 Na is the only stable (and the only primordial) isotope.It is considered a monoisotopic element and it has a standard atomic weight of 22.989 769 28 (2). The atomic number therefore tells you what the element is (see. The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. There are 21 isotopes of sodium (11 Na), ranging from 17 Na to 39 Na (except for the still-unknown 38 Na), and two isomers (22m Na and 24m Na). All sodium atoms must have 11 protons in their nucleus. This means that sodium has precisely 11 protons, each carrying a positive. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10 -19 coulombs. Sodium, with its atomic number 11, signifies the number of protons in its nucleus. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. Sodium is a chemical element with atomic number 11 which means there are 11 protons in its nucleus. Atomic Number – Protons, Electrons and Neutrons in Sodium Element: Sodium: Atomic number: 11: Atomic mass amu 22.9897: Atomic mass pm 166: Density at STP g/cm3 0.
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