Chemistry, 29.10.2019 14:31 CrystalMoreno

Chemistry for apex for 10th grade ?

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To determine the Lewis dot diagram structure for the first compound.

1.Simply count the number of valence electrons for each element.
(Multiply atoms of there is more than 1)
Then add all of them together.

C - 4
3 H - 3 • 1 = 3.
Cl - 7

Follow the instructions and place C in the middle. Then place 3 H surrounding the carbon and also a Cl surrounding the carbon.

H
H C Cl
H

Now place in 2 electrons for each bond between each of the atoms. For C - Cl place 2 electrons in between and do this for all of the bonds.

Then place the remaining electrons as a pair on the atom that needs those electrons to have the correct number of valence electrons in this case, Cl.

Now subtract the total number of valence electrons calculated from the valence electrons that you have placed in the structure. It should equal 0.

If that is the case, it is correct. In terms of the molecular shape, because there are 4 things/atoms surrounding the central atom, we describe this as tetrahedral.

Search up online or in text about the different molecular shapes possible.

For the next molecule do the same exact procedure.

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

the answer is 0.8m.

by: nicholas

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