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Elements have a certain number of protons(+), neutrons(0) and electrons(-). The atomic number shows the number of protons and electrons in the element (has to have the same number of each to stay stable). The Atomic Mass shows the number of neutrons. For example, Hydrogen has an atomic mass of ~1.01 (and an atomic number of 1). That means that it has 1 electron and 1 proton but no neutron (1 proton+0 neutrons=1). Helium has an atomic mass of ~4.00 (and an atomic number of 2). That means that it has 2 electrons, 2 protons and 2 neutrons (2 protons+2 neutrons=4).
Hope you can understand. :S
What else can I help you with?
Why aren't the atomic masses of most elements whole numbers?
The atomic masses of most elements are not whole numbers because they take into account the average mass of all the isotopes of that element, which have different masses due to varying numbers of neutrons. This results in a weighted average that is not a whole number.
The atomic weight scale is based upon international agreement that?
the atomic weight scale is based upon the relative atomic masses of elements compared to carbon-12, which has an assigned value of 12. This standardization allows for consistency and accuracy in comparing the masses of different elements.
Which elements would be different from Mg?
Elements different from Mg would have a different number of protons in their atomic structure. This means they would have different chemical properties and varying atomic masses. Examples of elements different from Mg include Na, Al, Cl, and Ca.
What are the three pairs of elements that are out of order in the periodic table in terms of their atomic masses. Why it is necessary to invert their order in the table?
The three pairs of elements that are out of order in terms of their atomic masses are iodine and tellurium, cobalt and nickel, and uranium and neptunium. It is necessary to invert their order in the table to maintain the order of increasing atomic masses within each group or period, ensuring that elements with consecutive atomic numbers also have consecutive atomic masses.
How did Mendeleev arrange chemical elements?
He arranged the elements in the increasing order of their atomic masses and repeating periodic properties.
Do all elements have different atomic masses?
yes
What has different atomic masses?
Different atoms and elements that have different number of protns, neutrons and electrons.Duh!
What do you call atoms of the same element with different atomic masses?
They are called isotopes. They have different mass nmbers because they have a different number of neutrons.
Do uranium isotopes have different atomic masses?
Yes, each isotope has a specific atomic mass; this is correct for all the elements.
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 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.
The current standard for atomic masses is?
The current standard for atomic masses is based on the Carbon-12 isotope. It is defined as exactly 12 atomic mass units (amu), with all other atomic masses determined relative to it. This standard allows for consistency in measurements and comparisons of atomic masses across different elements.
Why the mass number of the same atom of an element is not constant?
Since you have isotopes of elements. Isotopes are elements with different number of neutrons hence why the different atomic masses for the same elements.
Are all sample of elements are composed of atoms with same atomic mass?
No, different samples of an element can have varying atomic masses due to the presence of isotopes. Isotopes are atoms of the same element with different numbers of neutrons, leading to different atomic masses.
When masses combine to form elements with larger masses?
Atomic fusion occurs when masses combine to form elements with larger mass.
What elements have such small masses that they are not even considered when atomic masses are calculated?
Electrons
Why aren't the atomic masses of most elements whole numbers?
The atomic masses of most elements are not whole numbers because they take into account the average mass of all the isotopes of that element, which have different masses due to varying numbers of neutrons. This results in a weighted average that is not a whole number.
