https://hobart.k12.in.us/ksms/PeriodicTable/energy%20levels.htm

Navigate by clicking the element on the table above or using the table below. Electrons orbit the atom's nucleus in energy levels. ... Beryllium, 4, 4, 5, 2, 2, 2.

https://opentextbc.ca/geology/chapter/2-1-electrons-protons-neutrons-and-atoms/

For helium, it is 4: two protons and two neutrons. ... For elements that do not have a full outer shell, the outermost electrons can interact with the outermost ...

https://chem.libretexts.org/Courses/Eastern_Wyoming_College/EWC%3A_Introductory_Chemistry_(Budhi)/04%3A_Atoms_and_Elements/4.5%3A_Elements%3A_Defined_by_Their_Number_of_Protons

Jan 14, 2019 ... Since an atom of one element can be distinguished from an atom of another ... Determine the number of protons, neutrons, and electrons in an atom. ... Therefore the mass of most helium atoms is 4 atomic mass units (2amu ...

https://www.thoughtco.com/atomic-number-4-element-facts-606484

Sep 19, 2018 ... Learn about the element that is atomic number 4 on the periodic table. ... A stable atom would have 4 neutrons and 4 electrons. Varying the ...

http://www.chemicalelements.com/elements/be.html

Number of Protons/Electrons: 4. Number of Neutrons: 5. Classification: Alkaline Earth Crystal Structure: Hexagonal Density @ 293 K: 1.8477 g/cm3. Color: gray ...

https://www.quora.com/How-many-protons-neutrons-and-electrons-does-beryllium-have

Beryllium (Be) has an atomic number of 4. This means it is the fourth lightest element, and 4th in the periodic table. More importantly, this ...

https://www.khanacademy.org/science/biology/chemistry--of-life/electron-shells-and-orbitals/a/the-periodic-table-electron-shells-and-orbitals-article

The Bohr model and atomic orbitals. Using an element's position in the periodic table to predict its properties, electron configuration, and reactivity.

https://en.wikipedia.org/wiki/Electron_shell

The list below gives the elements arranged by increasing ... helium have the number of electrons in the valence shell in arithmetic progression. ... 32, Germanium, 2, 8, 18, 4, 14.

https://www.khanacademy.org/science/chemistry/periodic-table/copy-of-periodic-table-of-elements/v/periodic-table-valence-electrons

How to determine the number of valence electrons and draw Lewis structures for main group elements starting from the electron configuration.

https://en.wikipedia.org/wiki/Valence_electron

In chemistry, a valence electron is an outer shell electron that is associated with an atom, and ... The presence of valence electrons can determine the element's chemical properties, such as its valence—whether it may bond with other ... Valence energy levels correspond to the principal quantum numbers (n = 1, 2, 3, 4, 5 .