the periodic table Flashcards
1
Q
what do periods indicate
A
the number of energy levels in an atom
2
Q
what do group numbers indicate
A
the number of valence electrons
3
Q
group 1 properties
A
-low melting boiling points
-low densities
-good conductors
react with oxygen to form metal oxide
-react with acid to give salt and hydrogen
-react with water to give metal hydroxide and gas
4
Q
group 1 trends
A
- reactivity increases down the group
- softness increases down the group
- melting and boiling points decrease down the group
- densities increase down the group
5
Q
group 7 properties
A
- diatomic in nature
- do not conduct electricity
- sparingly soluble in water
6
Q
group 7 at rtp
A
- chlorine is a yellow-green gas
- bromine is reddish-brown liquid
- iodine is black solid
7
Q
trends group 7
A
- reactivity decreases down the group
- density increases down the group
- colour of elements become darker the group
8
Q
transition metals physical properties
A
- harder, tougher, stronger
- high melting and boiling point
- high densities
9
Q
transition metals chemical properties
A
- less reactive than group 1 metals
- form coloured compounds
- act as catalysts
- have variable oxidation states
10
Q
noble gases
A
- unreactive, monoatomic gases
- completley filled outer shells
- group 0/group VIII
- used to provide an inert atmosphere (helium baloons, argon lamps)
