Atoms, Isotopes, Elements (6-8) (paper 1) Flashcards
what do atoms contain
- protons
- neutrons
- electrons
what is the mass of a proton
1
what is the mass of a neutron
1
what is the mass of an electron
0.0005
what are the two subatomic particles with the same mass
neurtron and proton
what is the charge of a proton
+1
what is the charge of a neutron
0
what is the charge of an electron
-1
where is the nucleus of an atom
in the middle
what does a nucleus contain
- protons
- neutrons
what is the charge of the nucleus and why
positive because of the protons
where do electrons exist in an atom
on energy levels called shells
what does the size of an eletrons orbitals determine
the size of the atom
what are the two numbers of an atom
- atomic number
- mass number
what does the atomic number tell you
how many protons there are
what does the number of protons determine
the type of element
what does the mass number tell you
the number of protons and nuetrons
what is meant by the term isotope
isotopes are different atomic forms of the same element, which have the same number or protons but a different number of neutrons
what is the equation for relative atomic mass
((mass of isotope 1 x percentage) + (mass of isotope 2 x percentage)) / 100
what is an element
substance consisting of one type of atom only
what is a compound
a substance which is made up of two or more different elements which are chemicallt bonded together
is it easy to seperate a compound
no
what is a mixture
two or more elements mixed together that are not chemically bonded
is a mizture easy to seperate
yes
is a mixture a pure substance
no
what is the difference between a mixture and a compund
a compound is chemically bonded to another type of element, a mixture is not
what is a pure substance
a substance made up of a single element or compound
how can you tell if a substance is pure
it has a specific, sharp melting and boiling point
