chapter 8 Flashcards
particles can exist in the form of…?
atoms molecules and ions
what is an atom
an atom is the basic unit of an element
what is an atom made of
electron neutron proton
what are electron neutron proton classified under
subatomic particles
relative mass of electron proton neutron
1/1840, 1 , 1
relative charge of electron proton neutron
-1, 0, +1
explain why an atom is electrically neutral
it does not carry an overall charge beacuse the number of electron adn protons are the same hence the positive and negative charges are equal
how to find proton number in an element
it is the atomic number (no. abv period table element)
how to find electron in an element
same as proton
how to find neutron in an element
mass number - atomic number (bigger-smaller) mass number is made out of proton and neutron
define what a molecule is
2 or more atoms chemically combined tgth
what is a molecule of an element
consists 2 or more of one singular type of atom
what is molecule of a compound
consists of 2 or more diff types of atom
what is symbol for oxygen
O
what is chemical formulae for oxygen
O2
with o2 u can tell that…
there are two atoms in oxygen
in H2O u can tell that
there are two hydrogen atoms and one singular oxygen atom
composition of air
(O2) oxygen is a molecule of element
(CO2) carbon dioxide is a molecule of compound
(N2) nitrogen is molecule of element
(H2O)water vapour is molecule of compound
(He)helium is an atom
whats an ION
if a atom loses electrons, it is positively charged
if an atom gains electrons, it is negatively charged
both atom and molecules are …. type of partical
neutrally charged
