Wikipedia
mass number element : The mass number is different for each different isotope of a chemical element. This is not the same as the atomic number (Z) which denotes the number of ..... More from Wikipedia
mass number element : Note 1: The element does not have any stable nuclides, and a value in brackets, e.g. [209], indicates the mass number of the longest-lived isotope of the ..... More from Wikipedia
Equal Sets
Two sets A and B are said to be equal if and only if they contain the same elements i.e. if every element of A is in B and every element of B is in A. We denote the equality by A = ..
Total number of subsets in a set is 2n
The total number of all possible subsets of a given set containing n elements is 2 ..
This presentation shows how the elements are the building blocks of all matter. It describes the atoms, bonds between atoms, molecules, atomic number, atomic mass (weight), isotopes, atomic excitation and ionization.
www.mindbites.com Professor Harman explains isotopes and atomic mass in this lesson covering atomic structure. Most elements exist in nature as more than one isotope. Isotopes are atoms that have the same number of protons as the element but a different number of neutrons. The number of protons always remains the same, as this number (also known as the atomic number) is what determines the element. Prof. Harman also introduces atomic mass units, or amu's, which are a more convenient unit ...
Question : The mass number is the sum of the protrons and neutrons of an element, right? The number of neutrons for each element is not recorded on the periodic table of elements because that number can change depending on differnt atoms. I recently found out that you can figure out the (average?) number of neutrons in an element by subtracting the number of protons from the (rounded) atomic mass. With this new information, you could figure out the mass number of that element. However, wouldn't this mak..
Answer : The atomic mass and the mass number should be roughly the same, yes. But "about the same" isn't the same as "exactly equal." It all depends on the number of different isotopes there are and in what ratios they exist. For example: Carbon has 6 protons. 98.9% of carbon atoms have 6 neutrons and a mass number of 12, and 1.1% of carbon atoms have 7 neutrons and a mass number of 13. The atomic mass on the periodic table reflects these percentages, so the average mass is listed as 12.01, which is very close to 12 but still off by 0.01 due to that tiny percentage of carbon atoms that have an extra neutron. Bromine, on the other hand, has 35 protons. 50.7% of bromine atoms have 44 neutrons (mass number 79) and 49.3% of bromine atoms have 46 neutrons and a mass number of 81. Since the ratio is roughly 50/50, the atomic mass on the periodic table is pretty close to the average of the two (79.9). Since bromine has two roughly equal isotopes, the atomic mass is much further off .... More from Yahoo Answers
Answer : The atomic mass and the mass number should be roughly the same, yes. But "about the same" isn't the same as "exactly equal." It all depends on the number of different isotopes there are and in what ratios they exist. For example: Carbon has 6 protons. 98.9% of carbon atoms have 6 neutrons and a mass number of 12, and 1.1% of carbon atoms have 7 neutrons and a mass number of 13. The atomic mass on the periodic table reflects these percentages, so the average mass is listed as 12.01, which is very close to 12 but still off by 0.01 due to that tiny percentage of carbon atoms that have an extra neutron. Bromine, on the other hand, has 35 protons. 50.7% of bromine atoms have 44 neutrons (mass number 79) and 49.3% of bromine atoms have 46 neutrons and a mass number of 81. Since the ratio is roughly 50/50, the atomic mass on the periodic table is pretty close to the average of the two (79.9). Since bromine has two roughly equal isotopes, the atomic mass is much further off .... More from Yahoo Answers
Question : (**A mass number is an element's protrons and neutrons added together**)
I just need to know how many protrons and neutrons Vanadium has to find out the mass number.
Thanks
~JCP
Answer : Electrons per shell 2, 8, 11, 2 Standard atomic weight 50.9415 g mol 1.. More from Yahoo Answers
Answer : Electrons per shell 2, 8, 11, 2 Standard atomic weight 50.9415 g mol 1.. More from Yahoo Answers
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