electronegativity

Question 1

def.

Answer 1

the relative power of an atom to attract the shared pair of electrons in a covalent bond

Question 2

trends

Answer 2

increasing across periodsdecreasing down groups

Question 3

why does it increase across periods

Answer 3

nuclear charge increases, shielding stays the same and atomic radius decreases

Question 4

why does it decrease down groups

Answer 4

nuclear charge increases, BUT shielding increases and atomic radius increases.

Question 5

what is a polar covalent bond

Answer 5

a polar covalent bond arises when electron density is not equally shared, therefore shared pair of electrons not equally shared, therefore partial charges arise

Question 6

when do polar bonds also arise

Answer 6

when there is a difference win electronegativity between fused atoms

Question 7

Suggest why the electronegativity of the elements increases from lithium to fluorine.

Answer 7

More protons / bigger nuclear chargeSame or similar shielding / electrons in the same shell or principal energy level / atoms get smaller

Question 8

Although phosphine molecules contain hydrogen atoms, there is no hydrogen bonding between phosphine PH3 molecules.Suggest an explanation for this.

Answer 8

Difference in electronegativity between P and H is too small