atoms elements and periodic table Flashcards
1
Q
3 things a scientist concluded about atoms
A
all matter is made up of atoms, there are different types of atoms and each element contains a different type of atom
2
Q
what is an atom
A
small particles, cant be seen directly
3
Q
what is an element
A
substance that only contains one type of atom
4
Q
what does the periodic table show
A
all elements discovered
5
Q
elements with similar properties are arranged into vertical columns of what
A
groups
6
Q
what are the horizontal rows in periodic table called
A
periods
7
Q
whats the happens to the reactivity of the metals in group 1
A
the lower you go, the more reactive they are
8
Q
what happens to the reactivity of the group 7 non metals
A
they get less reactive as you go down
9
Q
which group if elements are are very unreactive
A
group O
