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Wiki User
Answered 2012-01-05 02:27:07
Atomic masses of elements are usually not whole numbers because of isotopes.
Elements tend to exist as more than one isotope, so the atomic mass in the corner is a weighted average of all of the isotopes an element exists as.
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Related Questions
How are the atomic numbers and the atomic masses of the elements related to how the elements are arranged on peridoic table?
Elements are arranged in a periodic table by atomic number, lower on top and left. Atomic masses have no direct relationship to the arrangement of atoms, although generally atoms with higher atomic numbers will have higher atomic masses. (There are at least three exceptions for atoms with atomic numbers differing by 1.)
Why aren't atomic masses of elements not whole numbers?
because of its no. in table of elements
How are isotopes related to atomic masses not being whole numbers?
isotopes are elements of the atomic number but have different mass numbers.
Why don27t elements in the periodic table have whole numbers for their atomic masses?
Because the masses of protons, neutrons and electrons are not whole numbers.
Why the atomic mass numbers listed for elements on the Periodic Table are not whole numbers.?
Why are atomic masses of elements not generally whole numbers? The atomic masses listed on the periodic table are a weighted AVERAGE of an element'sisotopes. ... An element's atomic number is the number of protons in its nucleus. Number of protons specifies atom type.
What is the relationship between an elements isotopes and the elements atomic mass?
Each isotope of an element has an atomic mass. The average of all the atomic masses of an element's isotopes gives an elements atomic weight. For this reason, atomic weights are decimal numbers.
Why did Dmitri Mendeleev make the periodic table of elements?
Dmitri Mendeleev made the Periodic Table of Elements simply to explain atomic masses and atomic numbers. It also explains groups of elements.
If the atomic mass and the atomic number are not the same what conclusions can you draw about that element?
That it is not hydrogen-1. All other elements and their isotopes have differing atomic masses and numbers.
How are elements with atomic masses greater than Uranium's made?
Elements that have greater atomic masses then uranium are created using nuclear fission.
What did Dimitri Mendeleeve do?
Dmitri arranged the elements in order of increasing atomic masses. He arranged elements in rows and columns according to atomic masses.
Which information did Mendeleev have about the elements he organized into a periodic table?
Mandaleef arranged the elements on the basis ofgradualincrease in their atomic masses. he was well informed about the atomic masses of different elements.
What is mendeleev's periodic law?
the principle that chemical properties of the elements are periodic functions of their atomic numbersMendeleev's periodic law states that properties of elements are periodic functions of their atomic masses.
Where can you found the symbols for elements?
A periodic table is a chart with all of the elements and their symbols, their atomic numbers and atomic masses. Good ones will also have the name of the element to make finding them easier.
How do atomic numbers and atomic masses increase in the periodic table?
The atomic number and atomic masses increase as you move from left to right.
How was mendeleevs scheme for listing elements different from modern periodic table?
Modern periodic table is arranged according to the atomic numbers of elements and Mendeleev's periodic table was arranged according to the atomic masses of elements.
When masses combine to form elements with larger masses?
Atomic fusion occurs when masses combine to form elements with larger mass.
Why are atomic numbers used instead of atomic masses in grouping the element on the periodic table?
The reason atomic numbers are used instead of atomic masses because of Mendeleev's. These are in the same group.
Why are the atomic masses of most elements rarely whole numbers?
1. First cause: the atomic weight is the sum of the weights of protons, neutrons ans electrons.; they don't have masses as integers.2. Second cause: also occurs the so-called mass defect.Not atomic mass for elements; atomic weight is correct.
Why does the atomic mass of some elements is shown as a decimal value?
Many atoms exist in the form of different isotopes. These have different numbers of neutrons and so their atomic masses are different. The atomic mass for the element is the average of these masses, weighted together according to their abundance.
What element has a smaller atomic mass than element 5?
If "element 5" in this question means the element with atomic number 5, then all of the elements with atomic numbers 1 through 4 have smaller atomic masses. These elements are hydrogen, helium, lithium, and beryllium.
What do you call atoms of the same element with different atomic masses?
Elements of the same element with different atomic masses are called isotopes.
Why aren't the atomic masses of most element whole numbers?
Because their atomic masses are so precise and small that they can't be.
Early attempts at organizing the elements arranged them according to?
properties of the elements and atomic masses
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