C1 The Periodic Table Flashcards
where are the non-metals on the PT
to the right of the stepped line
how do you tell if a metal is metal or non-metal
you exaimine its properties
what are the propities of metals
good conducter of electricity good conducter of heat shiney high density malleable ductile sonorous
what are the properties of non-metals
the opposite of the metal propities
Most metals have high….
melting points - they are solid at 20degrees
many non-metals have low….
boiling points - they’re gases at 20degrees
what are metalloids
elements near the stepped line - their propities are between metals and non-metals
whats a difference between metal oxides and non-metal oxides
most metal oxides are solids at 20degrees where non-metal oxides are gases and dissolve in water to from an acidic solution.
what are groups
in the PT the vertical columns are called groups - the elements in a group have similar properties.
what happens going down a group
melting point increase
boiling points decrease
what is group 1 called
alkali metals
what is group 2 called
alkali earth metals
what is group 0/8 called
noble gases
what does the bottom number in a PT element square mean
atomic (proton) number
what does the top number mean in a PT element square
relative atomic mass (weight)
what are periods
the horizontal rows on the PT - going across a period there are patterns in the propities of the elements.
what is strage about the elements in group one
they have low melting points but their metals
the group one elements are very….
reactive - they take part in chemical reactions easily.
what do the group one elemnts react with and make
they react with water and produce hydrogen gas.
what is the pattern in the reactions in group one
they produce hydrogen and metal oxide
eg… lithium + water = lithium hydroxide + hydrogen
what happens to the reactions as you go down group one
they get more vigorous - exciting
what are the name of group 7
halogens
