Electronegativity Flashcards Preview

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Flashcards in Electronegativity Deck (11):
1

Define Electronegativity:

A measure of the power an atom has to attract the electrons in a covalent bond towards itself

2

Electronegativity increases...

...as you go along (left to right) and up the periodic table

3

What is the most electronegative element?

Fluorine

4

Electronegativity depends on: (3 things)

1. Nuclear Charge 2. Size of the atom 3.Shielding

5

How does 'nuclear charge' affect electronegativity?

(nuclear charge depends on the number of protons in the nucleus)

  • the more protons in the nucleus
  • the more positive charge
  • therefore the stronger attration between the nucleus and the negative charge (electrons)

6

How does the 'size of an atom' affect electronegativity?

  • the atom is smaller
  • therefore the nucleus is closer to the shared electrons
  • so theres greater electronegativity

7

How does 'shielding' affect electronegativity of an atom?

  • the larger the nuclear charge the greater the shielding effect
  • therefore theres greater electronegativity

-

  • same energy level = same shielding
  • only levels closer to the nucleus affect shielding

8

What does this diagram show?

 

Q image thumb

A and B have the same electronegativity

9

What does the term 'same electronegativity' mean?

  • both elements have the same tendancy to attract bonding pairs of electrons
  • on average the electrons are found half way between the atoms
  • the atoms would be of the same element, e.g. H2

10

What does this diagram show?

Q image thumb

  • The atoms have different electronegativity
  • B is slightly more negative than A

11