Search found 13 matches

by Irvin Xu 4I
Sat Dec 13, 2014 12:13 am
Forum: Trends in The Periodic Table
Topic: Isoelectronic atoms and ions
Replies: 1
Views: 320

Re: Isoelectronic atoms and ions

The more protons in the element, the smaller the ionic radius. This is because isoelectronic elements have the same number of electrons. However, the number of protons is different. More protons means stronger nuclear charge, and therefore the electron will be pulled in closer. In the example you ga...
by Irvin Xu 4I
Mon Nov 03, 2014 9:14 am
Forum: Lewis Structures
Topic: Deciding on the Lewis structure
Replies: 2
Views: 380

Re: Deciding on the Lewis structure

You forgot that Carbon needs a stable octet. In your structure, carbon only has 6 electrons, as opposed to the desired 8.
Hope this helps.
by Irvin Xu 4I
Thu Oct 30, 2014 8:03 pm
Forum: Octet Exceptions
Topic: Expanded Valence Shells
Replies: 4
Views: 850

Re: Expanded Valence Shells

I believe P, S, and Cl can hold all 10 extra electrons in the 3d subshell after the octet is filled, but you won't see that very often.
by Irvin Xu 4I
Thu Oct 30, 2014 9:35 am
Forum: Octet Exceptions
Topic: Expanded Valence Shells
Replies: 4
Views: 850

Re: Expanded Valence Shells

P, S, and Cl can all have expanded octets. The rest of the elements in the third period will not form expanded octets because they are metals, and therefore would "give away" electrons" so they would never have enough electrons to even use their 3d subshell.
by Irvin Xu 4I
Wed Oct 29, 2014 6:24 pm
Forum: Octet Exceptions
Topic: Lewis Structure of Hydrogen Sulfite
Replies: 2
Views: 800

Re: Lewis Structure of Hydrogen Sulfite

Hydrogen is more likely to bond to one of the oxygen atoms because oxygen is more electronegative than sulfur is.
by Irvin Xu 4I
Wed Oct 29, 2014 5:58 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Sulfite Ion Shape
Replies: 1
Views: 2524

Re: Sulfite Ion Shape

Sulfur is the central atom, and has 3 O's bonded to it (1 double bond, 2 single bonds). When giving each of the O's an octet, you'll still have 2 electrons (1 electron pair) left over that will go on the sulfur. Usually the more electronegative element will take the extra electrons, but oxygen canno...
by Irvin Xu 4I
Wed Oct 29, 2014 5:44 pm
Forum: Lewis Structures
Topic: An explanation of expanded octets?
Replies: 3
Views: 12720

Re: An explanation of expanded octets?

Rarely, if ever, will you see a metal in the 3rd period or higher be the central atom in a Lewis structure, because metals form ionic bonds, not covalent ones (occassionally you'll see a smaller metalloid, like Boron, be the central atom and form covalent bonds). Since metals are "giving away&q...
by Irvin Xu 4I
Wed Oct 29, 2014 5:17 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: 2.77
Replies: 2
Views: 1014

Re: 2.77

For part a, I actually think that KCl would be more soluble in water, because like dissolves like, meaning polar solutes dissolve well in polar solvents. Since KCl is more ionic (greater difference in electronegativity) it will dissolve better in water than AlCl 3 will. As for part b, Ba has a lower...
by Irvin Xu 4I
Wed Oct 29, 2014 5:07 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen and Covalent Bonds
Replies: 1
Views: 312

Re: Hydrogen and Covalent Bonds

Hydrogen is a non-metal, and therefore forms covalent bonds.
Hope this helps.
by Irvin Xu 4I
Wed Oct 29, 2014 5:06 pm
Forum: Octet Exceptions
Topic: Drawing Lewis Structures
Replies: 1
Views: 314

Re: Drawing Lewis Structures

Since the central atom will be the one with the lowest ionization energy, it will tend to also have a lower electronegativity, meaning it is unlikely for it to have a charge. So yes, you should draw the Lewis structure where the formal charge on the central atom is zero.
by Irvin Xu 4I
Wed Oct 29, 2014 4:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecules with an odd number of electrons
Replies: 1
Views: 374

Re: Molecules with an odd number of electrons

You won't see ClO 2 or ICl 2 . Those molecules will often be seen as anions, ClO 2 - and ICl 2 -. You can determine the molecular shape as you would for any other molecule. So for ClO 2 -, you'll have Cl in the middle because it has a lower ionization energy. Then you'll put bonds between the Cl and...
by Irvin Xu 4I
Wed Oct 29, 2014 4:26 pm
Forum: Lewis Structures
Topic: An explanation of expanded octets?
Replies: 3
Views: 12720

Re: An explanation of expanded octets?

Non-metals with a d-subshell are able to have expanded octets. For instance, elements 13-17 can have expanded octets. You’ll know to draw an expanded octet when the central atom is bonded to more than 4 elements. The elements that are metals (transition metals included) will tend to give away electr...
by Irvin Xu 4I
Fri Oct 24, 2014 10:18 am
Forum: Octet Exceptions
Topic: OCTET EXCEPTIONS
Replies: 2
Views: 495

Re: OCTET EXCEPTIONS

Boron and Aluminum can be exceptions to the octet rule. Take for instance BF 3 . There would be a single bond between the Boron and each flourine, and then the rest of the electrons are equally distributed between the 3 F's. In this case, the boron atom would only contain 6 electrons. The same can b...

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