Chemistry, 12.10.2019 22:30 claudiseliss4910

All man-made and most carbon-based compunds are

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Answer from: yair7

Artificial compounds such as charcoal and fire

Answer from: sibbietiggy9372

Explanation:

Organic compounds are the compounds that consists of chains of carbon atoms.

Most of the compound present in nature are made up of carbon atoms. And it is true that carbon has more number of compounds as compared to any other element.

For example, refined oil that we use for cooking has carbon atoms and it is a man-made product.

Therefore, we can conclude that all man-made and most carbon-based compounds are organic.

Answer from: Quest

idk i’m struggling too

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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