Periodic table Flashcards
How do metallic properties of elements change across a period?
from left to right, metallic properties decrease
How do metallic properties of elements change across a group?
going down the group, metallic properties increase
How are elements in the same period similar?
the number of electron shells are the same
How are elements in the same group similar?
the number of valence electrons are the same
What are the physical properties of alkali metals? [3]
soft and can be cut easily
low melting and boiling points
low densities
How do the physical properties of alkali metals change going down the group?
melting and boiling points decrease
densities increase
What are the chemical properties of alkali metals? [3]
react with cold water to form alkali and hydrogen
powerful reducing agents
form ionic compounds
Do all alkali metals have the same reactivity?
reactivity increases
What are the physical properties of halogens? [2]
low melting and boiling points
coloured
How do physical properties of halogens change going down the group?
melting and boiling points increase
colours become darker
What are the chemical properties of halogens? [2]
undergo displacement (more reactive displace less reactive) powerful oxidising agents
Do all halogens have the same reactivity?
reactivity decreases
What are the properties of noble gases? [5]
monatomic colourless at room temperature low melting and boiling points insoluble unreactive
Why are noble gases unreactive?
full valence shell
What are the uses of noble gases?
helium in balloons
neon in lights
