0 0. The most common (in fact, pretty much 100%) is Na-23 which has a mass number of 23 (11 protons, 12 neutrons). Sign in. The mass number. X. Mass number is protons plus neutrons and can be different for different isotopes. #Z#, UNEQUIVOCALLY identifies the atom; #Z=11# for sodium, #Z=10# for neon; #Z=12# for magnesium. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. 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. A mass number of 23 means … 23g per mol (23 amu per each) 0 0. It is considered a monoisotopic element and it has a standard atomic weight of 22.989 769 28 (2).Sodium has two radioactive cosmogenic … Therefore . There are 2 isotopes of sodium, Na-22 and Na-23. Anonymous. 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. Table \(\PageIndex{1}\): Atoms of the First Six Elements; Name Symbol Atomic Number (Z) Note that, each element may contain more isotopes, therefore this resulting atomic mass … You can sign in to vote the answer. aprox. The chemical symbol for Sodium is Na.. Atomic Mass of Sodium. This atomic mass is calculated by adding together the number of protons and neutrons present in the atom's nucleus. Sodium is a metallic element on the periodic table with an atomic number of 11 and an atomic mass of 22.98 amu. ››More information on molar mass and molecular weight. The element also has an atomic number of 11, meaning that it has 11 electrons and 11 protons. But the number of #"nucular protons"#, i.e. 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. Sodium was discovered by Sir Humphrey Davy in 1807. Atomic Number of Sodium. Anonymous. is given at the top left of the element's symbol, for example, sodium has a mass number of 23. Atomic mass of Sodium is 22.9897 u. The Mass Number of an element is equal to the protons added to the neutrons. Get your answers by … 1 decade ago. 0 0. Consider the table below, which shows data from the first six elements of the periodic table. How do you think about the answers? Sodium (Na) Sodium has an atomic number of 11 and a mass of about 23g. Mass Number of Sodium. 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 … There are 21 recognized isotopes of sodium (11 Na), ranging from 18 Na to 39 Na and two isomers (22m Na and 24m Na). Still have questions? The element sodium has 12 neutrons. The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Mass numbers of typical isotopes of Sodium are 23. We know that the atomic number of sodium is 11. 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. 1 decade ago. 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