1s 2 2s 2 2p6 3s2 3p6 4s2
or
Ar 4s2 (Noble gas form)
In noble gas form, you go back to the noble gas (the last group on the Periodic Table) prior to the element you are writing the configuration for. The electron configuration is the same up until that point. Then you write down the difference.
In this example, the electron configuration for Argon (Ar) is 1s2 2s2 2p6 3s2 3p6. If you fill up the shells until 4s2, you get calcium. It's faster to abbreviate by saying "Ar 4s2"
For carbon, each element box contains the element's name, symbol, atomic number, atomic mass, and electron configuration. For hydrogen, the box includes the element's name, symbol, atomic number, atomic mass, and electron configuration.
The lowest atomic number ion is Se^2-. The highest atomic number ion is Sr^2+. The ones in the middle are NOT Br^- or Rb^+. However, I do not know what the correct answer for those two is.
There are a total of 14 electrons in this electron configuration. The element whose atomic number corresponds to 14 is silicon.
The electron configuration provided belongs to the element lead (Pb), which has an atomic number of 82.
Mn
Vanadium ( V) has that configuration. Its atomic number is 23.
The atomic number of zinc is 30. Its abbreviated electron configuration is [Ar]4s23d10 The full electron configuration is 1s22s22p63s23p64s23d10 (configurations for the atom in its ground state. Ions and excited atoms have different configurations).
The element with this electron configuration is carbon (C). This electron configuration corresponds to 6 electrons, which is the atomic number of carbon.
1s2 2s2 2p6 3s2 3p3 is the electron configuration of element 15.
The element with electron configuration 1s22s23p1 is phosphorus, which has an atomic number of 15.
This electron configuration corresponds to the element Palladium (Pd), which has the atomic number 46. It has the electron configuration [Kr] 5s2 4d10.
The element with the electron configuration of 1s22s22p63s23p6 is neon, which has atomic number 10 and is a noble gas.
The spdf electron configuration for the element with atomic number 20 (calcium) is 1s2 2s2 2p6 3s2 3p6 4s2.
The electron configuration of aluminum (Al) is [Ne] 3s2 3p1
The ground state electron configuration for the element with the atomic number corresponding to the keyword "fe" is Ar 3d6 4s2.
The element with that electron configuration is Iron.
The electron configuration of the element with the atomic number 39 (yttrium) is: [Kr]4d15s2.