it tells you how much mass is in that object
There's a very nice article at wikipedia about mass numbers. Please feel free to follow the provided link.
The mass number tells you the number of Protons and Neutrons in an atomic nucleus.
The mass number of the element chlorine is 35.5. The mass number (nucleon number) of an isotope of an element tells us the sum of the number of neutrons and protons. It is a decimal because mass numbers of elements are averages, based on the different isotopic forms of the element and their relative abundance.
The atomic weight (not mass) of a chemical element is the ratio between the average mass of the atoms of this element to 1/12 from the atomic mass of carbon-12.The atomic mass is a term applied only to specific isotopes; the unit is the same as above.The mass number tells us the number (the sum) of protons and neutrons in the nucleus of an atom.The atomic number, on the other hand, tells us how many protons are in the nucleus of an atom.IUPAC publish periodically tables of atomic weights - the last edition is from 2009-2010.For the atomic masses of isotopes the last published edition is The AME 2003 atomic mass evaluation, edited by Audi, Wapstra and Thibault.
Type your answer here..The Atomic Mass Unit tells us that ,How heavy a substance as compare to the other.
As a first approximation it tells us simply the total number of protons and neutrons in the nucleus. The electrons and binding energy of the nucleus contribute a very much smaller amount to the mass. Since the number of protons in a given element is constant (the atomic number), we can also tell the number of neutrons in an atom by subtracting the atomic number from the atomic mass (approximately). Since different isotopes of each element have different numbers of neutrons (but the same number of protons), they will have different atomic masses. The given atomic weight for a particular element is usually based on the relative abundance of the isotopes as they occur in nature. It is also true that elements with very high elemental weights tend to be unstable, that is, radioactive. (Referring to the Wikipedia entry on "atomic mass" I see that what I have defined here may include some of the sense of "atomic weight", however the difference is subtle. See that entry for further clarification.)
The mass number tells you the number of Protons and Neutrons in an atomic nucleus.
atomic mass is the no. of protons+no. of nuetron
The atomic number is the number of protons in the nucleus.The Atomic Number of an element helps us to locate that particuarler element on the Periodic Table of Elements.
It tells us the total mass of Protons and Neutrons, in AMU, Atomic Mass Units.
The mass number of the element chlorine is 35.5. The mass number (nucleon number) of an isotope of an element tells us the sum of the number of neutrons and protons. It is a decimal because mass numbers of elements are averages, based on the different isotopic forms of the element and their relative abundance.
The number of valence electrons tell us the group number of that element.
The atomic number is the number of protons in the nucleus.The Atomic Number of an element helps us to locate that particuarler element on the Periodic Table of Elements.
The valence of the element
The atomic number tells us the number of protons in the nucleus of an atom. The atomic mass tells us the sum of the protons and neutrons in a nucleus.The atomic weight (not mass) of a chemical element is the ratio between the average mass of the atoms of this element to 1/12 from the atomic mass of carbon-12.The atomic mass is a term applied only to specific isotopes; the unit is the same as above. Is a value denoting the total mass of all the protons, neutrons, and electrons in an isotope.The mass number tells us the number (the sum) of protons and neutrons in the nucleus of an atom.The atomic number, on the other hand, tells us how many protons are in the nucleus of an atom.IUPAC publish periodically tables of atomic weights - the last edition is from 2009-2010.For the atomic masses of isotopes the last published edition is The AME 2003 atomic mass evaluation, edited by Audi, Wapstra and Thibault.
The mass number tells us the number (the sum) of protons and neutrons in the nucleus of an atom.
Calcium is a metal element. Atomic number of it is 20.
None. The relative abundance of isotopes is used to calculate the Average Mass (by multiplying the Atomic Mass of the isotopes by their relative abundancies and adding the products together) while the Atomic Mass is simply the number of protons plus the number of neutrons.