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There are two reasons:
- most naturally occurring elements are mixtures of different isotopes of the element, each having a different Atomic Mass which when the weighted average is calculated would not give whole numbers even if the individual atomic masses were all whole numbers
- the Mass Defect caused by the conversion of some of the mass of the protons and neutrons in the nucleus being converted to Binding Energy according to the equation E = M*c^2 which means that no more than one isotope of one element will have a whole number atomic mass which at various times was arbitrarily chosen to be hydrogen-1 (very old), oxygen-16 (old), nitrogen-14 (old), or carbon-12 (current) and new non-whole number atomic masses were recalculated for all other isotopes based on that one whole number atomic mass of the selected isotope.
Wiki User
∙ 8y ago
Wiki User
∙ 15y agobecause the mass of an electron is extremely small, making the atomic mass a whole number would be saying that the electron has no mass
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Where are the proton and nuetron located on the periodic table?
In modern periodic tables, they arent; in order to find the number of neutrons in an atom you must subtract the atomic number (the number of protons) from the atomic mass (rounded to the nearest whole number). In older ones (from the 1930s), neutrons are listed as Element 0, but outside of very extreme environments (specifically, the core of a neutron star), that element simply does not exist, so it's no longer on the table.
How do you find the number of neutrons in an atom if that number is not told to you?
if you arent given the atomic numbert for an element - where could you find it?
Why are groups 14 and 15 better representatives of mixed groups than are group 13 or group 16?
Groups 14 and 15 on the Periodic Table feature elements which are metals, non-metals, and metalloids.
Why do elements in the same period have property's that are different from one another?
They have different numbers of valance electrons...
What amount of nickel is in White Gold?
your a blob, arent you. i turned you into nickel.
Where are the proton and nuetron located on the periodic table?
In modern periodic tables, they arent; in order to find the number of neutrons in an atom you must subtract the atomic number (the number of protons) from the atomic mass (rounded to the nearest whole number). In older ones (from the 1930s), neutrons are listed as Element 0, but outside of very extreme environments (specifically, the core of a neutron star), that element simply does not exist, so it's no longer on the table.
What can you do if the fraction you have can not be easily be converted?
if your numbers arent whole numbers then multiply them out until they are whole numbers that are easier to work with.
Two different masses are they falling at the same speed?
they arent falling at the same speed because gravity is stronger with a heavier object
How do you know if you were born with the power to bend the elements?
sorry to burst your bubble but......you just arent
What is a typical number on a stem and leaf?
ther usually arent numbers on leafs look on jerseys 4 numbers
Why does the periodic table include elements that arent found naturally?
Because it is intended to represent all known elements, not only those which exist in nature.
How do you find the number of neutrons in an atom if that number is not told to you?
if you arent given the atomic numbert for an element - where could you find it?
What if you have a triangle with no number and is trying to find the area?
measure it with a ruler if there arent any numbers...
Why is atmosphere a mixture and not a compound?
Because the elements in the air arent bonded chemically, they are just literally mix together.
WHAT 11 equals 89?
nope. 11 dont equal 89. those numbers arent close at all duhhh
Is counting numbers whole numbers?
Whole numbers are 1,2,3,4..etc frations decimals and other numbers arent. Whole numbers include 0, counting numbers do not. Counting Numbers are also sometimes referred to as Natural Numbers. But the above answer is correct in that none of these sets: Counting, Whole and Integers include fractions or decimals.
Are all noble gases nonreactive?
All noble gases are unreactive at S.T.P. However at high temperature and pressure, xenon and krypton will react with electronegative elements such as flourine and oxygen to form fluorides and oxyfluorides.
