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Hydrogen and Helium both only need two valence electrons to fill their outer shell.

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13y ago

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Which two atoms will have their outer energy level filled with 2 electrons?

Helium (He) and Neon (Ne) will both have their outer energy level filled with 2 electrons.


How many electrons are in the outermost energy level of carbon and how many does it need to have this energy level filled?

Carbon has four electrons in the outermost energy level, which is energy level two. It needs eight electrons to have this energy level filled.


What element has atoms with only one completely filled principal energy level?

undiscovered...yet, but there are a few...go forward 50 years and see


Helium atoms only need how many valence electrons to have a filled outermost energy level?

Helium atoms only need 2 valence electrons to have a filled outermost energy level because helium is in the first period of the periodic table and its outermost energy level can only hold a maximum of 2 electrons.


Which atoms will have their outer energy level filled with 2 electrons?

There are more than two such atoms. Perhaps there was a list of atoms you had to chose from. Anyway, two such atoms are beryllium and magnesium.


How many valence electrons does heluim need to have a filled outermost energy level?

Helium only needs two electrons to have a filled outermost energy level.


An atom with an incompletely filled outermost energy level is likely to be?

An atom with an incompletely filled outermost energy level is likely to be reactive. This is because atoms tend to gain, lose, or share electrons to achieve a stable outer electron configuration. Atoms with incomplete outermost energy levels are looking to fill or empty their outermost energy level to achieve stability.


How many electrons does it need to have in the outermost energy level filled?

8 electrons


How many electrons are in the outermost level of carbon how many electron does it need to have fill this energy level?

Carbon has four electrons in the outermost energy level, which is energy level two. It needs eight electrons to have this energy level filled.


What atoms need only 2 valence electrons to have a filled out level?

Helium.


Which electrons in an atom have the highest energy level?

Electrons in the outermost energy level (valence electrons) have the highest energy level. These electrons are involved in the atom's chemical reactions and bonding with other atoms.


An atoms second energy level can hold up to how many electrons?

Maximum of 8 electrons in second energy level.