unit one - 1.1 (fundamental ideas in chemistry) and 1.2 (limestone and building materials) Flashcards
1
Q
relative charge of a proton
A
+1
2
Q
relative charge of a neutron
A
0
3
Q
relative charge of an electron
A
-1
4
Q
overall electric charge of atom
A
neutral
5
Q
number of electrons is equal to
A
number of protons
6
Q
particular elements have the same number of
A
protons
7
Q
atomic number
A
number of protons
8
Q
mass number
A
sum of protons and neutrons
9
Q
elements in the same group will have
A
same number of electrons in their highest energy level
10
Q
group 0
A
noble gases
11
Q
why are noble gases unreactive
A
full highest energy level (8)
12
Q
how many electrons does helium (noble gas) have in it’s highest energy level
A
2
13
Q
how do atoms join together to form compounds
A
give, share or take to form ions/molecules
14
Q
compounds of non-metals and metals form
A
ions
15
Q
compounds of non-metals form
A
molecules (held together by covalent bonds)
