Unit 12- Periodic table Flashcards
How many electrons are there in the outer shell of group 3 elements?
3
Difference between group and period
Groups are column, periods are row.
Describe the trend in physical properties as you go down group 1 elements
Softness increases, density increases, melting point decreases
Describe the reaction between water and the first three group 1 elements (lithium, sodium, potassium)
Lithium floats and fizzes, sodium shoots across the water, potassium melts with the heat of the reaction.
State the trend in reactivity in group 1 elements
as you go down group 1 elements, reactivity increases.
Why do elements from same group react in a similar way
They have same number of electron in the most outer shell.
Why are group 1 elements so reactive
They only need to lose one electron to gain full outer shell, so they have a stronger drive to react. So they will lose electron and become ion
Describe physical properties of group 1 elements
Good conductor of heat and electricity, softer than other metals, low density, low melting and boiling point compare to other metals.
What’s another term to call group 7 elements
halogens
Are halogens poisonous
yes
Describe the trend of physical properties in group 7
As you go down group 7 elements, colour gets darker, density increases, boiling point increases
Describe the trend of chemical properties in group 7
AS you go down group 7 elements, reactivity decreases.
Explain why are group 7 elements so reactive
They only need to gain one electron to gain full outer shell, so they have a stronger drive to react. So they will gain electron and become ion
How the halogens react with halides
A halogen will displace a less reactive halogen from a solution of its halide( group 7 compound)
Why is group 8 elements not reactive
They have a stable full outer shell
