Periodic trends
What information does the period number provide about an atom?
the number of electron shells
Does the melting point increase or decrease down the Group?
Decrease
State a physical property that increases down the group
melting point, boiling point, colour intensity
All noble gases exist as ______________ molecules
monatomic
What do you know about the colours of transition metals
the IONIC compounds are coloured. The metal elements themselves are normally silvery grey (except for copper and gold)
Which property, metallic or non metallic, decreases across a period?
metallic property
Can lithium displace rubidium from its solution?
No. Lithium is less reactive.
ionic compounds with halogens are called _____________
halides
State one use of noble gas.
argon in lightbulbs, helium in balloons, neon in light strips
What is special about the oxidation states of transition metals?
the are varied
Elements in the same group have similar chemical properties. Explain why.
They have the same number of valence electrons.
Why is rubidium more reactive than sodium?
its valence electron is further from the nucleus, so it loses the electron more readily
What is observed when chlorine gas is bubbled into sodium iodide solution?
colourless solution turns brown due the formation of aqueous iodine.
Why are noble gases inert?
they have a stable electronic configuration / they dont lose, gain or share electrons
X, Y and Z are in the same period of the Periodic Table. X forms an acidic oxide, Y forms a basic oxide and Z forms an amphoteric oxide. If X, Y and Z were placed in order of increasing atomic number (lowest atomic number first), the order would be
Y - Z - X
Why are Group I metals stored in oil?
Prevent them from reacting readily wih water and oxygen in the air
Identify the oxidising agent and reducing agent in the following reaction.
Cl2 (aq) + 2NaBr (aq) --> 2NaCl (aq) + Br2 (aq)
oxidising: chlorine
reducing: NaBr