Bonding structures Flashcards
What is a molecule?
2 or more (non-metal ) atoms held together by covalent bonds
What is meant by a diatomic molecule?
( L.O. 20)
A molecule made up of 2 atoms
What are the 7 elements that exist as diatomic molecules?
( L.O. 20)
What is a covalent bond?
( L.O.17)
A shared pair of electrons
Why do elements take part in reactions?
( L.O.19)
To achieve a full outer shell and achieve a noble gas electron arrangement.
What type of elements form covalent bonds?
( LO : 18 )
Non - metal elements
What holds the atoms together when they form covalent bonds?
( LO : 17 )
The common (electrostatic) attraction the nuclei have for the shared pair of electrons.
How do non-metal atoms achieve a full outer shell when they react with one another?
( L.O.19)
They share unpaired electrons
What 4 shapes of molecules must we know?
( L.O 21)
What are the properties of covalent molecular substances?
( L.O. 24)
Why do covalent molecular substances have low melting and boiling points?
( L.O. 24)
Are covalent molecular substances soluble in any other liquids?
( LO 25 )
Yes. Hexane for example
What are the properties of covalent network substances?
( LO 26 )
Why do covalent network substances have high melting and boiling points?
( LO 26 )
Why do covalent network substances NOT conduct electricity?
Because the charged particles ( electrons) are NOT free to move.