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Elements and Compounds
Molecular Mass

What is the molecular mass of first 20 element?

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molecular mass is same as atomic mass


Neon is a non meta element. Atomic mass of it is 20.


Neon, symbol Ne, has an atomic mass of about 20.


Fluorine is a non metal element. Atomic mass of it is 19.


No of moles= given mass/molecular mass = 600/30= 20 moles


The element with the atomic number of 20 is calcium. Mass number is the number of protons and neutrons in the nucleus of an atom of a particular isotope, but does not determine which element it is.


Mass of 1 atom of C-12 atom = 12 amuMass of 20 atoms of C-12 = amuMolecular mass of AB = 320 amuRachel- examville tutor


Neon is a non metal element. Atomic mass of it is 20.


Neon is a non metal element. Atomic mass of it is 20.


Neon is a non metal element. Atomic mass of it is 20.



Neon is a non meta element. Atomic mass of it is 20.


12. the atomic number of an element is the number of protons in it's nucleus. The mass number is the number of protons+neutrons. Therefore the element has (32-20)12 protons.



Helium (mass = 4 amu) and neon (mass = 20 amu)



Calcium is a meta element. Atomic mass of it is 40. Atomic number of it is 20.


Isotopes of an element have differed mass numbers. When calculating the average mass number, for justification, the relative abundance is also considered. If we take neon as an example, it has two isotopes with the mass numbers 20 and 22 where the relative abundance is 80% and 20% respectively. The average relative atomic mass is; 20 x (80/100) + 22 x (20/100) = 20.4


Moles = mass / relative molecular mass. 360 / 1 + 1 + 16 = 20 moles


Neon is a non meta element. Atomic mass of it is 20. Atomic number of it is 10.




The number of neutrons is different for each isotope of an element: Number of neutrons of an isotope = atomic mass of the isotope - atomic number of the element Calcium has also 20 protons and 20 electrons.


Yes, Calcium has an atomic number of 20 but its atomic mass is actually 40.078 and it is the 5th. most abundant element by mass in the Earth's crust.


Mass numbers refer to the numbers of protons and neutrons in the nuclei of specific isotopes. It would be easier to ask for the atomic weights of the first 20 elements on the periodic table, because they are written along with element's symbol and atomic number. If you really want to know the mass numbers of the isotopes of the first 20 elements, I recommend looking up the Wikipedia article for each element.



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