2. Periodic Trends Flashcards
Electrons not in the outermost principal shell are ____ electrons
core electrons
Electrons in the outermost principal shell are ____ electrons
valence electrons
Effective nuclear charge ____ down the group
Decrease
Effective nuclear charge ____ across the period
Increase
Ionisation energy is the energy ____ to ____ 1 mol of electrons from 1 mol of ____ atoms/ions.
Required, Remove, Gaseous
Ionisation energy is defined for ____ (state) solid/liquid/gaseous atoms/ion?
gaseous
For ionisation energy what electron is removed?
Outermost electron
Ionisation energy is always ____thermic?
Endothermic
Generally, first ionisation energy ____ down the group?
Decrease
Generally, first ionisation energy ____ across the period
Increase
Electron affinity is the energy ____ to accompany ____ 1 mol of electrons to 1 mol of ____ atoms/ions.
Change, Addition, Gaseous
Electron affinity is generally ____thermic?
Exothermic
Electron affinity (EA) from second EA is always positive or negative?
Positive
Generally, Electron affinity ____ across the period
Increases
Generally, Electron affinity ____ down the group
Decreases
First electron affinity ____ across period from group ____ to ____.
Decreases, 1, 2
First electron affinity for noble gases are typically ____.
Positive
Groups ____ and ____ prefer to lose electron.
1, 2
Group ____ has filled ns sublevel.
2
Generally, electronegativity (EN) ____ across the period.
Increases
Generally, electronegativity (EN) ____ down the group.
decreases
Why properties of elements vary in a periodic fashion? Number of ____ (2 words) is periods.
valence electrons
