Chemsheets AS006 (Electron arrangement)

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Presentation transcript:

Chemsheets AS006 (Electron arrangement) 08/12/2018 www.CHEMSHEETS.co.uk GROUP 2 – PHYSICAL PROPERTIES © www.chemsheets.co.uk AS 1058 3-July-15

ATOMIC RADIUS more electron shells so bigger atoms Be Mg Ca Sr Ba © www.chemsheets.co.uk AS 1058 3-July-15

ATOMIC RADIUS From: http://2012books.lardbucket.org/books/beginning-chemistry/s12-05-periodic-trends.html

1st IONISATION ENERGY General trend down group atoms get bigger more shielding therefore weaker attraction from nucleus to electron in outer shell © www.chemsheets.co.uk AS 1058 3-July-15

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 © www.chemsheets.co.uk AS 1058 3-July-15