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The first electron energy level can only hold 2 electrons. Hydrogen only has 1 first energy level electron as it only contains one proton and one electron total.

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Q: How many first level electron did each atom contains?
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Related questions

How does an electron position in an atom affect the energy it contains?

If there is an extra electron in the valence level then the electron is in the excited state and is carrying more energy. If the atom is normal then it is in the ground stte and contains low energy.


Principal energy level 1 of an atom contains an electron with the lowest energy why?

level one electron contain more energy


How does an electrons position in a n atom affect the energy it contains?

If there is an extra electron in the valence level then the electron is in the excited state and is carrying more energy. If the atom is normal then it is in the ground stte and contains low energy.


What does a atom's outermost electron shell does?

The outer energy level is in the electron cloud surrounding the nucleus. Each ring that surrounds the nucleus is an energy level and contains a different number of electrons.


What does the nucleus of an atom contains protons and what?

nuetron and electron


When is an electron a valence electron?

when it is on the very outside level away from the nucleusA valence electron is one that occupies the highest energy level for any electron in a particular neutral atom. (There may be more than one such electron in a single atom.)It is an electron in the outermost shell of the atom.


What do you call an atom if you move an electron in an atom from a low energy level to a higher energy level within the atom?

no , it only emits energy if it moves from a higher energy level to a lower energy level.


When is electron a valence electron?

A valence electron is one that occupies the highest energy level for any electron in a particular neutral atom. (There may be more than one such electron in a single atom.) It is an electron in the outermost shell of the atom.


What is the consequence when an atom contains an extra electron?

It has a negative charge.


How many electron shells does an atom of oxygen have?

An oxygen atom has two shells. The first contains two electrons, and the second contains six electrons.


How many electrons fill the outer shell in hydrogen?

An energy level is the fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have. There are no full energy levels in an atom of hydrogen. The first energy level of any atom can hold 2 electrons. Hydrogen only has one electron and it is in the first energy level.


What state is an atom in which an electron has moved to a higher energy level?

An atom in which an electron has moved up to a higher level is in an excited state. The lowest state of the atom is called the ground state.Ê