1. Chemsheets AS006 (Electron arrangement)
08/12/2018
GROUP 2 – PHYSICAL PROPERTIES
© AS July-15

2. ATOMIC RADIUS more electron shells so bigger atoms Be Mg Ca Sr Ba
© AS July-15

3. ATOMIC RADIUS
From:

4. 1st IONISATION ENERGY General trend down group atoms get bigger
more shielding
therefore weaker attraction from nucleus to electron in outer shell
© AS July-15

5. MELTING POINT 2+ 2+ 2+ 2+ 2+ 2+ 2+ 2+ 2+ Calcium (Ca) Mpt 850ºC
Strontium (Sr)
Mpt 768ºC e- e- e- e- 2+ e- 2+ 2+ e- 2+ e- e- 2+ e- 2+ 2+ e- 2+ e- e- e- e- e- e- e- e- e- e- 2+ e- 2+ e- e- 2+ 2+ 2+ e- 2+ e- e- e- e- e- e- e- 2+ 2+ 2+ e- 2+ e- e- e- e- e- 2+ 2+ 2+ 2+ e- e- e- 2+ 2+ 2+ e- e- e- e- 2+ 2+ e- 2+
General trend down group
weaker metallic bonding
as metal ions are bigger
so lower melting points
© AS July-15