Which symbols would be included in the noble gas notation for an element that had valence electrons in the 5s subshell?
ar
kr
xe
rn

Kr.

Explanation:

1) The noble gas notation is used to abbreviate the writing of the electron distribution.

This is normally done because for many chemical explanations and predictions it is only important to deal with the valence electrons.

And that is what the noble gas notation shows. The noble gas notation indicates the symbol ot the noble gas immediately previous to the elment considered, inside square brackets, and after that shows the orbitals occupied by the rest of trhe electrons.

2) For example the element lithium has 3 electrons, so its regular (expanded) electron configuration is 1s² 2s. Since, the noble gas previous to lithium is helium, the noble gas notation is [He] 2s.

Other example. Aluminum has `3 electrons. Its regular electron distribuition is: 1s² 2s² 2p⁶ 3s² 3p, and, since the previous noble gas is neon, the noble gas configuration is [Ne] 3s² 3p.

3) Dealing with the question, you have that the noble gas previous to an element that had valence electrons in the 5s subshell is the noble gas in the period (row) number 4, which is Kr.

So, the noble gas of such element would be either [Kr] 5s or [Kr] 5s², depending on whether it has one or two valence electrons in the subshell s (assuming no electrons in the the orbitals 5p).

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.