Meh Flashcards
(37 cards)
What did mandeleev order his period table in order of
Relative atomic weight/mass
How did madeleevbreak his own rules
He arranged the elements by switching iodine and tellurium
Why did madeleev switch iodine and tellurium
They have similar properties to the other group
How did mandeleev know his table was correct
He predicted undiscovered evidence
How many electrons are in the outer shell of an electron
1
What is the trend in activity as you go down the group in group 1(alkalis)
It increases
What else increases as you go down the groups
Melting and boiling points
How many electrons are in the outer shell of halogens group 7
7
How do you calculate relative formula mass
Energy change = in(A) - out(B)
In= A -A
B-B
Out= 2 x A - B
What happens to the trend in reactivity as you go down group 7
Decreases
In group 0 noble gases how many electrons are in the outer shell
0
What is the trend in reactivity when going down group 0 noble gases
Unreactive
What type of bonding does brass have
Metallic
What type of bonding does sulfur dioxide have
Covalent
What type of bonding does nitrogen chloride have
Covalent
What type of bonding does copper oxide have
Ionic
What type of bonding does iron have
Metallic
What type of bonding does sodium fluoride have
Ionic
Describe the electronic structure of the atoms and ions
- metal atom loses electrons to become positive
- non metals gain electrons to become negative ion
- these then attract each other, this is called electrostatic attraction which binds the atoms together (ionic bonding)
Describe a high melting point
- giant lattice structure
- strong electrostatic attraction between oppositely charged ions
- needs a large amount of energy to break
Describe when ions conduct electricity when in molten or in solution
•ions can seperate and are free to move
Describe ions when they conduct electricity when solid
Ions are fixed and can’t move
Explain low melting point
- weak intermolecular forces between molecules
* needs a small amount of energy to break
Explain when ions can’t conduct electricity
- molecules have no overall charge as they are neutral
* Atoms are fixed and can’t move
