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As the Periodic Table of the elements is built up by adding the necessary electrons to match the atomic number, the electrons will take the lowest energy consistent with the Pauli exclusion principle.

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How many electrons are required to completely fill the third energy level?

no. of electrons to fill an energy level = 2n2. = 2x32 = 18


What the Aufbau principle state?

The principle is: electrons fill first the lower energy levels.


Why do electrons start filling the 1st energy level of an atom before the 2nd?

Electrons fill the 1st energy level first because it has the lowest energy and is closest to the nucleus. Electrons are attracted to the positively charged nucleus and fill the energy levels in order of increasing distance from the nucleus.


Do noble gases completely fill energy levels?

No, you are misinformed, it is electrons not gasses that fill energy levels.


How many electron are needed to fill the outer energy level of sulfur?

Sulfur has 6 electrons in its outer energy level. This means it needs 2 more electrons to fill its outer energy level, for a total of 8 electrons.


Must Electrons must fill the higher energy levels before they fill the lower energy levels?

No, electrons fill the lowest energy levels first before moving to higher energy levels. This follows the Aufbau principle, which states that electrons occupy the lowest energy levels available to them before filling higher ones.


How can atoms with fewer than 8 valence electrons fill their outmost energy level?

They ca fill their outmost energy level by gaining or losing electrons.


When an atom has one or more electrons in higher energy levels?

An atom has multiple energy levels. When an atom has more electrons than it can fit into an energy level, then it puts them into the next higher energy level.


How do electrons typically fill energy levels?

Electrons fill energy levels starting with the lowest energy levels before moving to higher energy levels. This process follows the Aufbau principle, which states that electrons fill orbitals in order of increasing energy. Additionally, the Pauli exclusion principle dictates that each orbital can hold a maximum of 2 electrons with opposite spins.


In what orders do electrons fill orbitals?

Electrons fill orbitals in order of increasing orbital energy. The exact order of these energy levels is shown at the related link below.


How many electrons are needed to fill the second outer energy level?

8 electrons


How many electrons fill the 3rd energy level?

In the 3rd energy level, there can be a maximum of 4 electrons.