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