Periodic Trends Part 2

shorthand notation for electron configurations

consists of the elemental symbol of the last noble gas prior to that atom, followed by the configuration of the remaining electrons.

Noble Gas Configuration for Boron is :[He] 2s2 2p1

Noble Gas Configuration for Oxygen is: [He] 2s² 2p⁴

What is the element represented by [Ne]3s23p2?

What element has this electron configuration [Ar]3d74s2?

is the energy required to remove an electron from a specific atom

Moving from left to right across the periodic table, the ionization energy for an atom increases

Within a group, the ionization energy decreases as the size of the atom gets larger

The larger an atom is, the more reactive it will be.

Period - reactivity decreases as you go from left to right. Period - reactivity increases as you go from the left to the right. Group - reactivity decreases as you go down the group.