Chemistry AS Edexcel (Atomic Structure & Bonding)

Which of the following ions has the biggest radius?

• S ^2-

• Cl^-

• K⁺

• Ca²⁺

The first five successive ionization energies for an element J, in kJ mol^-1 , are:

The formula of the compound of chlorine with element J is..

• JCl

• JCl₂

• JCl₃

• J₂Cl₃

Which of the following is the correct order of increasing melting temperature of elements of Period 3?

• Na, Mg, Al, Si

• Na, Mg, Si, Al

• Si, Na, Mg, Al

• Si, Al, Mg, Na

Which one of the following elements undergoes the change in electronic configuration shown when it forms the stated ion?

Atom 1s²2s²2p⁶3s²3p³

Ion 1s²2s²2p⁶3s²3p⁶

• B to B³⁺

• Al to Al³⁺

• N to N^3–

• P to P^3–

Which of the following observations provides the best evidence for the presence of ionic bonding in an unknown substance?

The substance conducts electricity

• in the solid state.

• in the solid state and in aqueous solution.

• in the solid state and when molten.

• when molten but not in the solid state.

In which of the following compounds is the anion most polarized?

• LiF

• LiI

• KF

• KI

Which of these electron density maps best represents the bonding in the compound lithium iodide, LiI?

• A

• B

• C

• D

Which of these has a dative covalent bond?

• NH₃

• OH^-

• H₂O

• H₃O⁺

Which of the following molecules is polar?

• Carbon dioxide, CO₂

• Silicon tetrachloride, SiCl₄

• Ammonia, NH₃

• Boron trifluoride, BF₃

In the ethene molecule, the C=C double bond is made up of

• two sigma bonds.

• one pi bond.

• two pi bonds.

• one sigma bond and one pi bond.