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Such atoms are isotopes and belong to the same element.
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What is the term for atoms of the same element that differ in their mass numbers?
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.
How do isotopes differ and why is the atomic number of elements not a whole number?
Isotopes differ from each other by having different numbers of neutrons but the same number of protons since they are only the same element if they have the same number of protons. Atomic numbers aren't whole because their mass is based of the mass of hydrogen and amu's (atomic mass units) and due to how elements are formed, minute amounts of mass are lost in order to form the nuclear bonds resulting in not whole numbers.
What does the mass number?
By knowing mass number of the elements we can easily find out the number of neutrons presen in the nuclei.Physical properties of elements somewhat depends on mass number.
Why are some isotopes weighted more heavily than others?
The type of element is decided by the number of protons in it's nucleus. Number of neutrons are either equal or more than number of protons. Mass of proton and neutron is almost equal and that of electron is almost negligible as compared to both of others. As number of neutrons differ, mass of the elements also differ. Though they have 'same' chemical properties. Such atoms with different mass are called Isotopes. If the number of neutron is more, then such Isotopes are having more mass (or weight.)
Isotopes of the same elements differ in number of?
Neutrons
Isotopes of the same elements differ in their number of?
neutrons
Do radioactive elements differ in atomic number?
yes
Does all atoms of a given element are alike in all respects?
No. Most elements have several isotopes, which differ in the number of neutrons, which in turn affects atomic mass.
Mass number of first 20 elements?
Mass number is term used for isotopes, not for elements. And it is boring to list here all the isotopes of the first 20 elements.
Does isotopes of elements differ in the number of neutrons in the nucleus?
yes
When atoms of the some elements differ in the number of neutrons?
isotopes
How are the elements in the modern periodic arranged?
The elements are ordered by their mass number.
