C8 the periodic table Flashcards
1
Q
describe the periodic table
A
- arrangement of elements in periods and groups
- in order of increasing proton/atomic number
2
Q
change across a period in periodic table
A
metallic to non-metallic characetr
3
Q
why do elements in the same group have similar chemical properties
A
- same number of electrons in outer shell
- this number determines how element reacts
4
Q
how does covalent radius change down a group and why
A
- increase
- number of shells of electrons increases
5
Q
how does covalent radius change across a period
A
- decreases
- increasing number of electrons and protons mean strong attractive force increases and pull electron shells closer to nucleus
6
Q
describe group I metals and their trends down the group
A
- relatively soft metals
- decreasing melting point
- increasing density
- increasing reactivity with water
7
Q
describe group VII and general trends down group
A
- diatomic non-metals
- increasing density
- decreasing reactivity
8
Q
appearance of chlorine at rtp
A
pale yellow-green gas
9
Q
appearance of bromine at rtp
A
red-brown liquid
10
Q
appearance of iodine at rtp
A
grey-black solid
11
Q
describe displacement reaction in grp vii
A
more reactive halogen replaces less reactive halogen in compound
12
Q
describe transition metals
A
- high densities
- high melting points
- form coloured compounds
- often act as catalysts as elements and in compounds
13
Q
describe group VIII and why
A
- unreactive (full outer shell)
- monoatomic (full outer shell, do not react)
