C2 Flashcards
1
Q
what is the mass number
A
the total number of protons and neutrons
2
Q
what is the atomic number
A
the number of protons
3
Q
how are ions made
A
when atoms gain or lose electrons
4
Q
what are negative ions
A
when atoms gain electrons
5
Q
what is a positive ion
A
when a atom loses a electron
6
Q
how many electrons on 1st shell
A
2
7
Q
how many electrons on 2nd shell
A
8
8
Q
how many electrons on 3rd shell
A
8
9
Q
what properties do group 1 elements have
A
they are reactive and soft
10
Q
do the melting and boiling points increase or decrease as you go down in group 1 elements
A
decrease
11
Q
state symbols in equations
A
s, l, g, aq
12
Q
is group 7 made of non-metals or metals
A
non-metals
13
Q
does the reactivity increase or decrease as you go down in group 7
A
decrease
14
Q
what are group 0 elements called
A
noble gases
