Chemistry, 11.11.2019 08:31 janeou17xn

When the excited electron in an atom moves to the ground state the electron is

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Answer from: giovney

It is said that when you apply light into an electron, a spark can be seen. This is what happens in the photoelectric effect. Photoelectric effect is seen on solids such as metals wherein it releases electrons when it is exposed in light. Energy in the form of light is being used by the electron to displace itself from its fixed position. An example is when you light a matchstick. The, head which contains phosphorus, electrons from its fixed position moves to a more excited energy level causing it to burst into flames.

Answer from: Quest

The gas would begin to expand, and eventually the can would burst or explode.

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.

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