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