Strength of covalent bonds (2d.3)

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Joseph Saba
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Joined: Thu Jul 11, 2019 12:16 am

Strength of covalent bonds (2d.3)

Postby Joseph Saba » Sat Nov 02, 2019 2:36 pm

Which of these compounds has bonds that are primarily ionic? a)BBr3 b)BaBr2 c)BeBr2
The correct answer is BaBr2 but i thought with bigger atoms the bigger they are the weaker the ionic bond.Therefore i put BeBr2. Can anyone explain this?

Ryan Chang 1C
Posts: 105
Joined: Sat Aug 24, 2019 12:17 am

Re: Strength of covalent bonds (2d.3)

Postby Ryan Chang 1C » Sat Nov 02, 2019 2:54 pm

Recall that ionic bonds form between molecules with a high difference in electronegativity, usually those with a electronegativity difference greater than 2. BaBr2 is the only molecule that primarily forms ionic bonds because the difference in electronegativity between Ba and Br is greater than 2. On the other hand, the difference in electronegativity between Be and Br and B and Br are less than 2.

Emily_4B
Posts: 57
Joined: Wed Sep 18, 2019 12:21 am

Re: Strength of covalent bonds (2d.3)

Postby Emily_4B » Sat Nov 02, 2019 3:00 pm

Ryan Chang 3A wrote:Recall that ionic bonds form between molecules with a high difference in electronegativity, usually those with a electronegativity difference greater than 2. BaBr2 is the only molecule that primarily forms ionic bonds because the difference in electronegativity between Ba and Br is greater than 2. On the other hand, the difference in electronegativity between Be and Br and B and Br are less than 2.


How do you find the values for the difference in electronegativity?

Rohit Ghosh 4F
Posts: 99
Joined: Thu Jul 25, 2019 12:17 am

Re: Strength of covalent bonds (2d.3)

Postby Rohit Ghosh 4F » Thu Nov 07, 2019 4:24 pm

You can look up something called the Pauling Scale. Basically this assigns elements a value for electronegativity.


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