Elements, Compounds And Mixtures Flashcards
An element
Contains only one type of atom.
A compound
Contains 2 or more types bonded together.
A mixture
Contains 2 or more types not bonded together.
Nucleus
Centre of a atom. Contains protons and neutrons.
Proton
Positively charged.
Neutron
Found in nucleus. It doesn’t have charge, so it’s neutral.
Electron
Orbit around nucleus. It’s negatively charged.
Electron shell
Electrons orbit the nucleus in a circle called an electron shell.
Mass number
Number of protons+neutrons
Atomic number
Number of protons/electrons.
Isotope
Atoms of the same element with different number of neutrons. They have same chemical properties but different physical.
Alloy
A mixture of metal and at least one other element. Finally alloy may have different properties to the original metal. Atoms are different sizes, so cannot slide over each other.
Steel
Metal+carbon
It makes it much stronger.
Pure metal
Atoms are arranged in rows. They can easily slide over each other.
Ducktile metals
Can be pulled/stretched into wire.
Malleable
Can be modeled/shaped.
Displacement reaction
The metal in a compound is replaced with more reactive metal to form new compound.
Ore
Naturally occurring mineral containing a valuable constituent for which is mined. Examples aluminum, copper, sodium, iron, silver
Thermal decomposition
Using heat to break down.
Atoms have no overall…
electrical charge.
The relative atomic mass of an element
The average mass of the atoms of an element compared with carbon-12(relative atomic mass exactly 12)
