Chemistry, 03.07.2019 16:00 reagancunningham2004

Coal is a renewable energy source is made from inorganic material takes millions of years to form releases fewer toxins than gas

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Answer from: granthazenp5e9mj

Takes millions of years to form hope this helped

Answer from: SupremeDiaz17

Option (c) is the correct answer.

Explanation:

Coal is a black-brownish sedimentary rock. It is produced from giant ferns, reeds and mosses which are present in the Earth.

For about millions of years when all these plants grew then due to the changes caused by heat and pressure there will occur changes in the plant layers.

These layers were fall short of oxygen and results in formation of carbon rich deposits.

Hence, coal takes millions of years to form.

Answer from: Quest

the link still does not work even when adding it to the url bar

explanation:

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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