Periodic Table Flashcards
(25 cards)
What does the periodic table include
All of the elements that we have discovered
Periods
Horizontal rows
Groups
Vertical columns
What are the properties of metals
Shiny
Good conductors of heat
Good conductor of electricity
High density
What is group 1 called
Alkali metals
What is group 7 called
The halogens
What is group 0 called
Noble gasses
Properties of alkali metals
• solids at room temperature (melting and boiling points decrease
moving down the group)
• very reactive (reactivity increases moving down the group)
• good conductors of heat and electricity
• soft
• shiny when cut
• low density
Properties of halogens
• some solids, a liquid and some gases at room temperature (melting and boiling points increase moving down the group)
• very reactive (reactivity decreases moving down the group)
• poor conductors of heat and electricity
• solids are brittle
• low density
Properties of noble gasses
gases at room temperature (the melting and boiling points increase as you move down the group)
• unreactive (however reactivity increases slightly as you move down the group)
• poor conductors of heat and electricity
• low density
Who put together the first version of the periodic table
Mendeleev
What does malleable mean
Metals can be hammered into thin sheets or bent without shattering
What is an alloy
A combination of different metals
Which metals are magnetic
Iron, nickel and cobalt
What do metals look like after being polished
Shiny
Do most non metals reflect light
Yes most non metals do not reflect electricity
Brittle meaning
Hard but can break easily
What are the melting and boiling points of non metals like
Low
Are non metals magnetic
No they most definitely arent
What are the factors of a polymer (plastics)
1) Polymers are usually insulators of heat and electricity.
2) They’re often flexible- they can be bent without breaking.
3) They have a low density - they can be very light for their size and strength. This makes them ideal for making things that need to be strong but not heavy.
4) They’re easily moulded - - they can be used to manufacture equipment with almost any shape.
Molecule definition
A group of atoms bonded together
Compound meaning
A thing made of 2 or more separate elements by a chemically combining them
Mixture meaning
2 or more elements formed by physically mixing them together
What is a composite material
Materials made from 2 or more materials stuck together
