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Why do elements always have the same atomic numbers but not the same atomic mass?
Wiki User
∙ 15y ago
Most elements have isotopes---atoms that have the same number of protons (and hence they are still that element) but different numbers of neutrons. For instance, sulfur found in nature has four stable isotopes: S-32 16 protons 16 neutrons S-33 16 protons 17 neutrons S-34 16 protons 18 neutrons S-36 16 protons 20 neutrons Each of these isotopes has a different mass, but all are sulfur because they have 16 protons.
Wiki User
∙ 15y ago
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What is the difference between isobar and isotope?
isobars are elements with same mass numbers (Atomic Mass) and different atomic number (number of proton or electron)
What guantities are always equal to an elements atomic number?
Mass
The atomic mass of the elements are not whole value numbers because of the existence of?
D. Protons
Why do atomic mass numbers have decimals for oxygen?
The mass number is the sum of protons and neutrons in the atomic nucleus of chemical elements. All mass numbers are integers. The atomic weight is not an an integer because is calculated taking in the account the isotopic composition of an element; also the mass excess has a role.
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 average of the mass numbers of an elements isotopes?
the Atomic Mass
What is the difference between isobar and isotope?
isobars are elements with same mass numbers (Atomic Mass) and different atomic number (number of proton or electron)
What guantities are always equal to an elements atomic number?
Mass
Did Dmitri Mendeleev organize elements by atomic numbers or atomic mass?
At first, he did it by atomic mass, but that didn't quite work out right, so he changed it to atomic number.
How are atomic numbers and mass numbers of elements arranged in the periodic table?
by ectron protons and neutrons
Why the mass numbers on the periodic table of elements are rarely whole numbers?
Elements also possess isotopes. So their average atomic mass is rarely whole number.
Can an atom of two different elements have the same mass number?
Yes. The mass number is basic to the different elements, even more useful than the atomic number. (Unless it is an isotope. Isotopes have a different amount of neutrons than the basic element atom which makes a difference in mass number too. So, a difference in mass numbers doesn't always mean it is a different element.)
The atomic mass of the elements are not whole value numbers because of the existence of?
D. Protons
Is your modern periodic table based on atomic mass or atomic number?
The modern periodic table is arranged according to the elements' atomic numbers.
What is the atom with same atomic number but different mass number?
We can find atomic mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.
Is the atomic mass equal to the number of atoms in the elements?
The mass number of an isotope of an element is equal to its atomic mass number. However, the atomic weight of an element is a weighted average of the isotopes that occur in the element in nature. Because almost all elements have more than one naturally occurring isotope (if they have any), the atomic weights of most elements are not integers, as mass numbers always are.
Why do atomic mass numbers have decimals for oxygen?
The mass number is the sum of protons and neutrons in the atomic nucleus of chemical elements. All mass numbers are integers. The atomic weight is not an an integer because is calculated taking in the account the isotopic composition of an element; also the mass excess has a role.
