Each chemical symbol is for a chemical element; each chemical element has a specific atomic number and an atomic weight (not mass, after the rule of IUPAC).
Mass number: A Atomic number: Z
28^Si and 14 protonsThe metalloid Si (silicon) is correctly matched with 14 protons, because the atomic number of Si is 14.
Atomic bombs contain uranium (highly enriched in the isotope 235U) or plutonium (a very specific isotopic composition).
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Here is the isotopic notation for carbon 14. From looking at the isotopic notation, you can find the number of protons, neutrons and electrons in an atom. Protons- The atomic number is 6, so there are 6 protons Electrons- If the atom is neutral the number of protons equals the number of electrons, so there are also 6 electrons Neutrons- The mass number equals the number of protons + neutrons, and 14-6 leaves 8 neutrons 14 C 6
When atomic mass is expressed in unified atomic mass units, it is similar to isotopic mass and has the same numerical value as that of atomic mass. The atomic mass or the relative isotopic mass is the mass of one atom which at a time can be only one isotope.
the average atomic mass is computed by summing all isotopic weights of the isotopes of that element and then dividing this by the the total number of isotopes of that element (note that isotopic mass is exactly the same as atomic weight, except for isotopes).
The atomic mass of isotopes is determined by mass spectrometry.
90.7 amu
28^Si and 14 protonsThe metalloid Si (silicon) is correctly matched with 14 protons, because the atomic number of Si is 14.
For the determination of the atomic weight (not mass) of chlorine we need to know the isotopic composition of Cl and the atomic masses of the isotopes.
The atomic weight (not mass) of any element is determined taking into account the isotopic composition and the atomic masses of these isotopes.
the atomic notation is 7 x 4940 equals folowing
Atomic bombs contain uranium (highly enriched in the isotope 235U) or plutonium (a very specific isotopic composition).
The atomic weight (not mass) of a chemical element is calculated considering the isotopic composition of the element and the atomic masses (not weights) of these isotopes.
The chemical symbol is Ne. An isotope is writted as: 2010Ne (20 is the atomic mass of the isotope, 10 is the atomic number of Ne).
Isotopic symbols are used to represent elements and isotopes. They consist of the element's symbol, atomic number (number of protons), and mass number (sum of protons and neutrons). For example, carbon-12 is represented as ^12_6C, where 6 is the atomic number and 12 is the mass number.