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How many of the first twenty elements in the periodic table have isotopes?
Wiki User
∙ 14y ago
19
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Actually all elements have isotopes. Isotopes are atoms that have different amount of neutrons. If you ever notice the atomic mass of an atom, it is the average Atomic Mass of all isotopes. If an atom had no isotope then that number would be an integer.
Wiki User
∙ 10y ago
Wiki User
∙ 14y agoThe fundamental criterion is whether the gram atomic mass of the atom is reasonably close to twice the atomic number. By this test, He, Li, C, N, O, Ne, Mg, Si, S, and Ca all qualify. (Hydrogen does have a fairly rare isotope that also qualifies.)
Wiki User
∙ 14y ago19
Wiki User
∙ 11y ago210
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What are the 1st 20 elements of the periodic table made of?
The first twenty elements are made up f different things
Elements on very first Periodic Table?
Yes, there were elements on the first periodic table. I believe that there are still elements on the periodic table.
What are the elements that are conductor from the first 20 elements of the periodic table?
Conductors in the first twenty elements include; Lithium - Li Beryllium - Be Carbon - C Sodium - Na Magnesium - Mg Silicon - Si Potassium - K Calcium - Ca
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.
How the first twenty elements were discovered?
The first twenty element was discover when there is science in the world
How many elements have there name ending in ium in the first twenty elements in the periodic table?
Calcium, Potassium, and Helium
What is liquid out of the first twenty elements?
at 250C and 101 kPa there are no elements that are liquid in the first twenty elements. the only elements on the periodic table that are liquid are bromine (atomic number: 35) and Mercury (atomic number: 80).
What are the 1st 20 elements of the periodic table made of?
The first twenty elements are made up f different things
How are the properties of the first twenty elements in the periodic table related to their atomic structure?
check this perodic table at www.calculatoredge.com
Elements on very first Periodic Table?
Yes, there were elements on the first periodic table. I believe that there are still elements on the periodic table.
What are the stable elements of periodic table?
First, it should be noted that it is not an element that is stable or unstable, but an isotope. If you don't know the difference, please read the Wikipedia article, or some other source, about "isotopes", Most of the elements up to #82 (Pb) have stable isotopes, with the exception of #43 (Tc) and #61 (Pm). Please note that all of these "stable elements" also have unstable isotopes!
What are Elements in the first row of the rare earth elements of the periodic table!?
Elements in the first row of the rare earth elements of the Periodic Table are called LANTHANIDES.
What are the elements that are conductor from the first 20 elements of the periodic table?
Conductors in the first twenty elements include; Lithium - Li Beryllium - Be Carbon - C Sodium - Na Magnesium - Mg Silicon - Si Potassium - K Calcium - Ca
How many of the first 18 elements of the periodic table are solid?
Out of the first 18 elements on the periodic table, 10 are solid
Can you find all naturally occurring compounds on a periodic table?
Periodic table lists elements and not compounds. Out of the first 92 elements, 1 being hydrogen (H) and 92 being uranium (U), there are 90 that are naturally occurring. Technetium (Tc) and promethium (Pm) are man-made elements and do not have any isotopes occurring naturally.
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.
Elements in the first row of the rare elements of the periodic?
the lanthanides
