Periodic Table Flashcards
1
Q
what did newland do?
A
Built on Dalton’s law of octaves
(Every 8th element had similar properties)
Arranged by atomic mass
Two elements in same box
2
Q
How is the modern periodic table arranged?
A
Metals/non metals
Arranged by proton number
Groups- number of electrons on outer shell
Periods-number of shells
3
Q
What are the properties of group 1 alkali metals
A
1+ ion Li,Na,K less dense than water React with water to make H2 Universal indicator- purple Reactivity increases down the group Larger atom Less electrostatic force
4
Q
Why are the properties of the group 7 halogens?
A
1- ion Colour vapours Diatomic molecules Forms ionic compounds with group 1 Reactivity decreases down the group Larger atom Less electrostatic forces to attract electron
5
Q
Explain halogen displacement
A
A more reactive halogen will displace a less reactive one from a compound
6
Q
Properties of transition metals compared with group 1
A
Higher density
Stronger/harder
7
Q
How did Mendeleev order the periodic table?
A
Arranged by atomic masses
Similar properties
Left gaps for elements yet to be discovered
