quiz 13 Flashcards
Describe the trend in the reactivity of the alkali metals
increases down the group
Explain why the noble gases are inert
They have full outer shells, so do not need to gain or lose electrons
A sample of lithium is heated and burned in oxygen. Give 2 observations seen during the reaction
A crimson flame is produced
The lithium melts
Give the state of bromine at room temperature
Liquid
In the context of elements and the periodic table, define trend
A pattern in properties
In a reaction, a more reactive element takes the place of a less reactive element in a compound. State the name given to this type of reaction
Displacement
Name the product of a reaction between an alkali metal and oxygen
a metal oxide
Explain why fluorine is more reactive than chlorine
It has fewer shells/electrons
It has a stronger attraction from the nucleus to the outer shell
It is easier to gain an outer shell electron
Explain why halogens are diatomic
They are made of 2 atoms bonded together in a small molecule
In terms of electrons, describe what alkali metals have in common
one electron in the outer shell
Describe the trend in the melting and boiling points in the halogens
increases down the group
Explain why the melting and boiling points of the halogens increases down the group
The molecules increase in size
the intermolecular forces become stronger
which require more energy to overcome
A sample of sodium is heated and burned in oxygen. Give 2 observations seen during the reaction
A yellow flame is produced
the sodium melts
Name the products of a reaction between an alkali metal and water
A metal hydroxide and hydrogen
