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for all elements, excluding hydrogen, there are 2 electrons in the first energy level. Hydrogen is the exception of this because it only has a single electron, thus it only has 1 in its first and only energy level.

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Related Questions

What does the period tell you about electrons?

The period tells you how many energy levels an atom has.


How many elements are there in the first period of periodic table?

There are 2 elements in the first period of the periodic table: Hydrogen and Helium.


How many electron shells does period 1 have?

Period 1 of the periodic table has only one electron shell. This shell can hold a maximum of two electrons, which are found in the hydrogen and helium atoms. Therefore, elements in this period have their electrons in the first and only shell, representing the simplest atomic structure.


How many electrons do period 3 in periodic table have?

period 3 elements in the periodic table have 3 electrons in there outher shell hence the name.


How many electons do the elements of the most stable group have in their outer energy level?

Eight, except for helium, which needs only two because: it has only s electrons' each period or atomic shell number can include only two s electrons; and the first period can have no p, d, or f electrons.


How many electrons live in the first orbital?

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How many inner shell electrons does chlorine contain?

Cl is in the 17 group. It is in the 3rd period. It has 3 energy levels.


How many electrons will the first shell hold?

there are two electrons the first shell hold


How many electrons at the maximum can be present in the first shell?

Two electrons can fit in the first shell


How many electrons can be in the first energy levels?

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What level is filled by krypton?

The fourth electron shell is filled by krypton. Krypton is the last element in the fourth period on the periodic table. Each of the periods represents an electron shell. Elements in the first period have electrons in the first shell; elements in the second period have electrons in the second shell; and so on.


Does the periodic table explain the shell model or does the shell model explain the periodic table?

The shell model explains the organization of the periodic table. The elements in the first period have electrons in the first shell; the elements in the second period have electrons in the first two shells; the elements in the third period have electrons in the first three shells; and so on.