Chemistry, 11.05.2021 15:40 eaves001

HELP PLEASE Excluding the noble gas group, how does the number of valence electrons in an element influence it chemical reactivity?

HELP PLEASE Excluding the noble gas group, how does the number of valence electrons in an element i

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Answer from: ImHotRacerYT

Well... the further an element is away from having a full valence shell, the more reactive they are, but all elements are reactive barring noble gases

Answer from: chris1619

A. Elements with intermediate numbers of valence electrons are the least reactive.

Explanation: I Quizzed

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

Woah that’s a lot to read xd i’ll try though. i’ll get back t you if. i know the andwer

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