Chemistry 25-09-24

Which molecule contains six bonding electrons?

• C₂H₄

• H₂S

• NCl₃

• SF₆

• 6.93

• 6.90

• 6.50

• 6.07

Which property of an atom does not affect its ionisation energy?

• The atomic radius

• The number of electron shells

• The number of neutrons

• The number of protons

Why is the second ionisation energy of sodium larger than the second ionisation energy of magnesium

• The attraction between the nucleus and the outer electron is greater in Na⁺ than in Mg⁺

• The nuclear charge of Na⁺ is greater than Mg⁺

• The outer electron of Na⁺ is more shielded than the outer electron of Mg⁺

• The outer electron of Na is in the same orbital as the as the outer electron of Mg

• A

• B

• C

• D

• B

• A

• C

• D

Which formula represents the empirical formula of a compound

• C₂H₄O

• C₂H₄O₂

• C₆H₁₂

• H₂O₂

• A

• B

• C

• D

In which species is there a lone pair of electrons?

• CH₃

• CH₃^–

• CH₃⁺

• CH₄

• A

• B

• C

• D