Periodic Trends
Chemistry · आवर्ती प्रवृत्तियां · 12 facts
1
Atomic radius decreases left to right in period (more protons)
2
Atomic radius increases top to bottom in group (more shells)
3
Ionization energy: increases left to right; decreases top to bottom
4
Noble gases have highest ionization energy in period
5
Electron affinity generally increases left to right
6
Electronegativity: Fluorine highest; increases L to R, decreases T to B
7
Metallic character decreases L to R; increases T to B
8
Cs most electropositive; Fr most reactive metal(rare)
9
Metal reactivity increases down group; non-metal decreases
10
Valency across period: 1,2,3,4,3,2,1,0 (main group)
11
Pauling scale: F=4.0, O=3.5, N=3.0, C=2.5
12
Ionic radius: cations smaller, anions larger than parent atom