atoms and periodic table Flashcards
what are atoms made of
- protons, 1+
- neutrons, 1+
- electrons, 9.109*10^-28
format of an atom
- nucleus, made of neutrons and protons
- shells, electrons
atomic number
how many protons there are in an atom
- the smaller number
mass number
total number of protons and neutrons in an atom
- the bigger number
what is an element
a pure substance which cannot be broken down and is determined by the number of protons
what are isotopes
different forms of the same element which have the same number of protons but a different number of neutrons
what is relative atomic mass
the average mass of an element calculated from its different isotopes
what is a molecule
2 or more atoms of the same element held together by chemical bonds
what is a compound
2 or more atoms of different elements held together by chemical bonds
what is a mixture
2 or more atoms which are not chemically bonded
- haven’t reacted with each other
how to separate insoluble solids
- filtration
filtration method
- pour mixture through a sieve/ filter paper
- collect liquid in beaker and solid in sieve
how to separate soluble
how to separate soluble solids
- place a
