1.5 And 1.7 Periodic Trends Flashcards
1
Q
How many elements were in the early periodic table?
A
63
2
Q
Who published 1st pertodic table
A
Mendeleev
3
Q
Explain metallic and non metallic reactivity
A
Metal: down = reactivity increases , across = reactivity decreases (right)
Mon metals: down = reactivity decrases , across (right) = increase
4
Q
How is atomic radius calculated?
A
2 atoms together divided by 2
5
Q
Explain ionic radius : cation and anion
A
Cation: as atom loses electron the radius decreases as theres less shells and more force can be exerted on
Anion (-): atom gains electron and radius increases as repulsion is greater amoung more electrons
6
Q
Ionization energy
A
Energy required to remove electron
7
Q
Electron affinity
A
Energy required to add electron
