Chapter 1- Periodic Table Flashcards
Describe the physical properties of group 1.
The alkali metals are very soft. Lithium is the hardest alkali metal and they become softer as you go down the group.
Describe the physical properties of group 7.
The halogens become darker as you go down the group. Fluorine is very pale yellow, chlorine is yellow-green, and bromine is red-brown. Iodine crystals are shiny purple - but easily turn into a dark purple vapour when they are warmed up.
What are displacement reactions in group7?
The Group 7 elements are known as the halogens. They are reactive non-metals and are always found in compounds with other elements. Chlorine, bromine and iodine are all halogens. To get them out of there compounds they need to react them with something more reactive than them.
What is a group?
A group in the periodic table is when a select few elements in a line going down have the same properties chemically and physically.
What is a period?
A period is the name given to a horizontal row of the periodic table.
The periodic table has seven periods.
Explain the chemical properties of group 1.
They have low densities (lithium, sodium and potassium will float on water)
they react quickly with water, producing hydroxides and hydrogen gas
their hydroxides and oxides dissolve in water to form alkaline solutions. They are very reactive and must be stored in oil to avoid contact with air or water.
Explain the chemical properties of group 7.
Group 7 is a mix of all the states (except plasma) solid,liquid and gases.
Describe the physical properties of group 0.
These are all gases so they have no physical properties.
Describe the chemical properties of group 0.
They are all un-reactive hens the name the noble gases.
Describe the trend in period 2.
As you go down the table they get higher boiling and melting points.
The differences between metals and non metals
physical properties.
Metals: All solids, have high boiling points and can be found in ores.
Non Metals: Not all solids, boiling points very and can’t be found in ores.
