TUOR. Idld 8 Chemistry End of Unit Test ACA 2020-2021 / 13 of 25
Il Pause
The diagram shows a model of an atom. The model has four different symbols on it. Each symbol represents
different role for one of the particles within the atom.
Model Atom
In this model, which particle determines the reactivity of this atom?
O
A W
O
B. X
O
C. Y
a
D. Z

Acm ruler with main graduations from 1 to 10 from left to right there are 10 secondary graduations between each of the main graduations there is a line that begins. at the left end of the ruler 10 secondary graduations to the left of the “1 main graduation the right end of the line ends on the eighth secondary graduation to the right of 3 how long is the line