8f Flashcards
what is a matter
anything made up of particles
what is an atom
smalllest building block of matter
what is an element
collection of atoms of the same type
what is a molecule
a small group of bonded atoms
what is a lattice structure
a large groups of bonded atons
what is a periodic table
an organised table of all 118 diffrent types of atoms/elements
how is is it organised(the periodic table)
1sepersted into metals and non metals
2.Groups (colums) contains elements with the similar physical and chemical properties
3. Periods increase in atomic numbers
What does the top number in the symbol tell you
The atomic mass (mass of atom)
What does the bottom number tell you
the atomic number (its rank number )
How did mendeleev organise the periodic table?
- Groups contained elements similar physical and chemical properties
- periods increased by atomic mass (not number)
What does the term eka mean
Below
Why did mendeleev leave gaps in the periodic table
He knew there were undiscovered elements
What are examples of physical properties
State ,boiling point ,shiny ,soft ,hard , conducts ,electricity ,conducts heat, dull ,brittle ,malleable
what are examples of chemical properties
Reactivity with diffrent checmicals
Colour changes during a reaction
What is the name of the group 1 metals
Alkali metals
What are the properties of the group 1 metals
They react with water : they react with acid :they react with oxyge :there soft:there shiny
What happens when an alkali metal reacts with an acid
Alkali metal + Water ~Mental Hydroxide +Hydrogen
Why are they called alkali metals
the mental hydroxide produced is an alkali
What are the properties of the halogens?
Fluorine- toxic gas ,used to make platic and non stick materials
Bromine- Brown Liquids ,used insecticides
Chlorine- Toxic gas kills germs ,used to disinfect
Iodine -Black solids used in anti -spectics
fluorine-kills germs bromine-used in insectic
chlorine-used in insectic
iodine-used in anti specifics
What we the group 0 non metals called
Noble gases
what r the noble gases used for
Helium balloons ,neon lights ,argon in bulbs and krypton in flash lights
