Sodium is a metallic element on the periodic table with an atomic number of 11 and an atomic mass of 22.98 amu. The element Sodium has an atomic number of 11 and an average atomic mass of 22.98 which makes the mass number 23. 23 Na is the only stable (and the only primordial) isotope. The element sodium has 12 neutrons. Atomic Number of Sodium. The chemical symbol for Sodium is Na.. Atomic Mass of Sodium. X. âºâºMore information on molar mass and molecular weight. The Mass Number of an element is equal to the protons added to the neutrons. A mass number of 23 means â¦ Anonymous. Therefore . Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. We know that the atomic number of sodium is 11. Mass Number of Sodium. Consider the table below, which shows data from the first six elements of the periodic table. You can sign in to vote the answer. There are 21 recognized isotopes of sodium (11 Na), ranging from 18 Na to 39 Na and two isomers (22m Na and 24m Na). It has an atomic mass of 22.9, which is often rounded up to 23 to accurately determine the number of neutrons in the element. The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. How do you think about the answers? Atomic mass of Sodium is 22.9897 u. aprox. But the number of #"nucular protons"#, i.e. Get your answers by â¦ An atomic number of 11 means this atom will have 11 protons. The most common (in fact, pretty much 100%) is Na-23 which has a mass number of 23 (11 protons, 12 neutrons). Sodium (Na) Sodium has an atomic number of 11 and a mass of about 23g. 0 0. #Z#, UNEQUIVOCALLY identifies the atom; #Z=11# for sodium, #Z=10# for neon; #Z=12# for magnesium. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Note that, each element may contain more isotopes, therefore this resulting atomic mass â¦ No of moles of Na = mass of Sodium/molar mass 1) frist we have to divide mass of Na w.r.t molar mass of Na #) molar mass of Na =23 gm/mol #) no of moles of Na =46/23 =2mol 2) than we easily get the no of moless. It is considered a monoisotopic element and it has a standard atomic weight of 22.989 769 28 (2).Sodium has two radioactive cosmogenic â¦ Sodium was discovered by Sir Humphrey Davy in 1807. no of atoms in Na =2 * avocadro no= 2 * 6.03 *10^23 =12.06 *10^23 atom 3) than we have to multiply the â¦ The sum of neutrons and protons, the massive nuclear particles, gives the mass number, with which we often label the elemental symbol as a left hand superscript. This atomic mass is calculated by adding together the number of protons and neutrons present in the atom's nucleus. Anonymous. 1 decade ago. The mass number. Name: Sodium Symbol: Na Atomic Number: 11 Atomic Mass: 22.98977 amu Melting Point: 97.72 °C (370.87 K, 207.9 °F) Boiling Point: 883 °C (1156 K, 1621 °F) Number of Protons/Electrons: 11 Number of Neutrons: 12 Classification: Alkali Metal Crystal Structure: Cubic Density @ 293 K: 0.971 g/cm 3 Color: silvery Atomic Structure Mass numbers of typical isotopes of Sodium are 23. Still have questions? Sign in. The element also has an atomic number of 11, meaning that it has 11 electrons and 11 protons. 0 0. Mass number is protons plus neutrons and can be different for different isotopes. 1 decade ago. There are 2 isotopes of sodium, Na-22 and Na-23. Table \(\PageIndex{1}\): Atoms of the First Six Elements; Name Symbol Atomic Number (Z) is given at the top left of the element's symbol, for example, sodium has a mass number of 23. 23g per mol (23 amu per each) 0 0. 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. Neutron number plus atomic number equals atomic mass number: N+Z=A. The protons added to the neutrons periodic table atomic mass is calculated by adding together number. 22.98 amu table below, which shows data from the first six of! Only stable ( and the only stable ( and the only stable ( and the stable! 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