Question
Consider the before and after illustrations below. Identify up to 3 things that have changed and at least 1 thing that has stayed the same
Which element is represented by the before picture?
Which element is represented by the after picture?
Protons
Neutrons O
Electrons •
Before
After
Group -+1
Period
2
3 4
5
6
7
8 9 10 11 12 13 14 15 16 17
18
H
4
Ве
3
5
B
A
128
Г30
S
32
3
He
10
Ne
18
Ar
35
135
Answer
Things that have changed: Group, Period, Atomic Number
Thing that has stayed the same: Element (H, He, Ne, Ar)