Periodicity and I.E.

Which factors cause ionisation energy down a group to decrease?

• More Protons

• Outer shell electron further from the nucleus

• More shielding from inner electrons

• Electrostatic attraction between nucleus and electron decreases

Which of these has the highest ionic radius?

• Br^-

• Se^2-

• Sr²⁺

• S^2-

Which has the highest ionisation energy?

• N

• O

• P

• Li

Answer explanation

Why is it easier to ionise oxygen than Nitrogen? Think about electrons in p orbitals

Which has the highest ionisation energy?

• Be

• B

• Li

• Al

Answer explanation

Why is boron's not higher than berylliums? Think about orbitals.

Which orbital is vanadium's highest energy electron in?

Which orbital is most effective at shielding?

• 3d

• 2p

• 3s

• 2s

Ignoring subscripts and using noble gas cores, what is the electron configuration of copper?

Which ion has the largest radius?

• Na⁺

• P^3-

• Si⁴⁺

• Cl^-

Which element is this?

What is the shape of phosphorous acid H₃PO₃