by the quantum number n.
if n=1 energy level is at 1
if n=2 energy level is 2 for example 2s1
Principal quantum numbers
Orbital quantum number
Fluorine has 7 valence electrons.
Valence electrons are those that exist in the highest main energy level in the last shell of an atom.
energy sublevel
The valence electrons are the electrons that undergo chemical bonding in the main group or representative elements.
highest occupied levelread the book, it is in bold and extremely easy to find.
The s sublevel in the third main energy level is indicated by 3s.
the first one because it is closer to the nucleus. :)
Fluorine has 7 valence electrons.
Valence electrons are those that exist in the highest main energy level in the last shell of an atom.
A stairway is a good model for the energy levels in an atom because there is a 'main floor' ( the nucleus ) and steps ( the energy levels ). The nucleus is the start of the stairway of the energy levels, and the other energy levels go off of the nucleus. The first energy level can hold 2 electrons, the second energy level can hold 8. The third energy level can hold 18, and the fourth energy level can hold 32 electrons. In order for an element to be as stable as a noble gas, the outermost energy level has to be full, so sometimes an atom will gain or lose electrons to fill it's outer energy level. Other times it might share electrons with other atoms, so that they don't have to gain or lose a lot of electrons. An example of this would be H2O ( water ). There is one oxygen atom with two hydrogen atoms connected to it, and sharing their electrons with each other.
energy sublevel
The valence electrons are the electrons that undergo chemical bonding in the main group or representative elements.
highest occupied levelread the book, it is in bold and extremely easy to find.
first energy level.
The main energy levels are also known as the electron shells of an atom. An electron is permitted to be around an atom.
A stairway is a good model for the energy levels in an atom because there is a 'main floor' ( the nucleus ) and steps ( the energy levels ). The nucleus is the start of the stairway of the energy levels, and the other energy levels go off of the nucleus. The first energy level can hold 2 electrons, the second energy level can hold 8. The third energy level can hold 18, and the fourth energy level can hold 32 electrons. In order for an element to be as stable as a noble gas, the outermost energy level has to be full, so sometimes an atom will gain or lose electrons to fill it's outer energy level. Other times it might share electrons with other atoms, so that they don't have to gain or lose a lot of electrons. An example of this would be H2O ( water ). There is one oxygen atom with two hydrogen atoms connected to it, and sharing their electrons with each other.
If the S orbital has two electrons and the P orbital has six you go on to the D orbital. Electron energy levels follow this format: 1s2 2s2 2p6 3s2 3p6 4s2 4p6 4d10 and so on