Groups In The Prriodic Table Flashcards
What are the 3 types of chemical bonds
Ionic
Simple molecular covalent
Giant molecular covenant
Properties of ionic bonds
Formed betweeen positive metal ion that has lost electron and negative non metal ion that gains the electron Strong bonds High melting points Most dissolve in water Conduct when molten but not when solid
Properties of simple molecular covalent
Atoms share electrons in outer shell to both have full outer
shells
Strong bonds between atoms but weak between neighbouring molecules
Low melting boiling pint, mostly gases at room temp
Some dissolve in water
Don’t conduct
Properties of giant molecular covenant
Atoms share outer electrons. Hold billions of atoms together in giant structures
Very strong between atoms across structure
High melting boiling pint, solids
Insoluble in water
On graphite conducts, rest don’t
What kind of atoms can have covalent bonds
Non metals with not fall outer shells
Properties of metals
Malleable
Held together by metallic bonds
Usually solid except mercury at room temp
Good conductors
What are alkali metals and properties
Metals found in group one, they are soft with low melting points compared to other metals. Also very reactive
Why does reactivity of alkali metals increase as you go down group one
The outer electron is further away from the nucleus as you go down the group as there are more shellls in between. This means the force between positive and negatives (protons and electrons) is less. This means it is easier for the atom to lose the outer electron, making it more reactive
What is the equation for a reaction between water and an alkali metal
Water + alkali metal —-> metal hydroxide + hydrogen
What are halogens
Elements in group 7
What is the equation for a halogen and metal
Metal + halogen —> metal halide
Potassium + bromine —-> potassium bromide
What is the change in properties as you go down group 7
Become less reactive and melting blinking points are reduced
What is a displacement reaction
When a more reactive element displaces a less reactive one from its compound, taking its place
What are noble gases and properties
Noble gases are the elements in group 8/0 and are inert meaning they are un reactive as they have full outer shells
How do properties change as you go down group 8
Gases become denser
