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There are either two He and Ne. These are truly complete as there are no more empty orbitals in their outer shells.
If you allow argon it has 3d orbitals empty and then so do the rest of the noble gases, so there would be more than 3.
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∙ 11y ago
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∙ 14y agoIf it has three outer electrons, it's in group 3. It has 2 shells, so it's in period 2. In Periodic Table this corresponds to B, boron.
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∙ 13y agoHe, Ne, Ar, Kr, Xe, Rn
khadijah joseph
carbon
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∙ 11y agosulfur
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Which elements have incomplete penultimate shells?
The transition elements have their penultimate shells incomplete
Elements with complete outer shells?
Elements with complete outer shells are Noble Gases.
Why does argon not combine readily with other elements?
It is non-reactive because it's shells are full. Argon has three electron shells. It's third shell is filled with eight electrons. That is why it does not easily combine with other elements.
What to all of the elements in period three have in common?
All the elements in third row have 3 shells. The electron enters in the third shell for all the groups.
As you move across a period elements have the same number of?
Electron shells
Which elements have incomplete penultimate shells?
The transition elements have their penultimate shells incomplete
What are elements of a group that has the same number of shells?
The elements in a group do not have the same number of shells, however, the elements in a horizontal row do have the same number of shells.
How does the Bohr model of the atom relate to the Periodic Table?
The Bohr model of the atom places electrons in orbits or "shells." Elements in the first period only have electrons in the first shell. Elements in the second period have electrons in the first two shells. Elements in the third period have electrons in the first three shells, and so on.
Elements with complete outer shells?
Elements with complete outer shells are Noble Gases.
Why does argon not combine readily with other elements?
It is non-reactive because it's shells are full. Argon has three electron shells. It's third shell is filled with eight electrons. That is why it does not easily combine with other elements.
How many electron shells does a sodium atom have?
A Sodium atom has three shells. For future reference, this can be discovered later by looking at which period an element falls in. For example, all group 1 elements have 1 shell, all group 2 elements have two shells, and so on.
What elements have outer shells?
protons
How many how many electrons does sodium have?
A Sodium atom has three shells. For future reference, this can be discovered later by looking at which period an element falls in. For example, all group 1 elements have 1 shell, all group 2 elements have two shells, and so on.
How many electrons does a sodium electron have?
A Sodium atom has three shells. For future reference, this can be discovered later by looking at which period an element falls in. For example, all group 1 elements have 1 shell, all group 2 elements have two shells, and so on.
What to all of the elements in period three have in common?
All the elements in third row have 3 shells. The electron enters in the third shell for all the groups.
Where are elements with full outer shells located on the periodic table?
Elements with full outer shells, the noble gas elements, are located in the column at the extreme right of the periodic table.
Do noble gases have valence shells?
Yes they have eight electrons in their valence shells. This is why they are not reactive. All elements have valence shells.
