2. Atoms and the Periodic Table

Determine the electron arrangement for the Cl^– ion.

Determine the electron arrangement for the Al³⁺ ion.

State the number of electrons lost or gained when the following elements form ions:

e. Rb

Explain why the hydride ion, H^-, has a noble gas configuration.

What noble gas has the same electron arrangement as the magnesium ion?

How does the octet rule explain the formation of a magnesium ion?