Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Periodic Table Trends Periodic Table Trends Metallic character Metallic Character • Depends on how readily the element gives up their valence e-’s Atomic Radius Additional shells Addition of one proton drawsacross the electrons closer to the nucleus Same shell the period Graph of Atomic Radius Electronegativity Electronegativity • The tendency of an atom to attract e-’s • Fluorine is the most electronegative element in the table • WHY? – Its empty valence shell is near the highly attractive (+) nucleus (note: has 9 protons) – No shielding effect from inner shells Ionisation Energy Ionisation Energy • The amount of energy (kJ) required to remove the most loosely held e- from an atom to form a positive ion – Eg. K (g) K+ (g) + e- (IE = 500 kJ) – Eg. Ne (g) Ne+ (g) + e- (IE = 2000 kJ) – A higher IE would mean a higher attraction to the nucleus Ionisation Energy • Affected by: – Charge of the nucleus – Distance of the e- to the nucleus – The # of inner e- shells shielding or screening the outer e-’s – If e- is single or paired within the orbital Reactivity