aqa unit unit 1 chemistry Flashcards
what is an element
its one type of atom
what is a compound
a substance made of two or more that are chemically bonded together
what is a mixture
two or more elements and compounds not chemically bonded together.
is oxygen an element compound or element
an element
is carbon dioxide an element compound or mixture
a compound
is air an element compound or a mixture
a mixture
how many carbon atoms are in CO2
1 carbon atom
how many chlorine atoms are in AL3CI6
six chlorine atoms
how many different elements are in C6H12O6
three different elements(carbon,hydrogen,oxygen)
what is the centre of an atom called
the nuclease
what are the three subatomic particles in an atom
protons electrons and neutrons
where are protons and neutrons located in the atom
in the nucleus
where are electrons located
in the shells
what is the charge of the neutron
zero
what is the mass of a proton electron and neutron
1,0,1
how many electrons can you fit in the first three shells
2,8,8
who came up with the plum pudding model
jj thomphson
who said that atom had a dense nucleus with electrons in orbit
ernest rutherfold
who said that the electrons were in the shells
niels bohr
who discovered the neutrons
james chadwick
what are the elements in group 1 called in the periodic table
alkali metals
what are the elements in group 7 called
halogens
what are the elements in group 0 called
noble gasses
why are the noble gasses unreactive
they all have a full outer shell
what happens to the reactivity down group 1
they get more reactive down the group
