1. Recall from chemistry that an ion is an electrically charged
atom, expressed by the notation X
N where X is the chemical
symbol and N is an integer representing the number of
S
2– fundamental charges the atom has in excess (+) or in deficit (–).
For instance, an aluminum atom missing three electrons would
×
be represented as Al
3+ . A sulfur atom with two extra electrons
would be represented as S
2– . The grid on the right depicts these
two ions situated in space.
a. Calculate the magnitude and direction of the net electric field
due to both the aluminum and sulfur ions at the point labeled ×.
Show your work neatly in the space below.
Al
3+ b. Draw in the electric field vector calculated in part (a) on the grid above. (What is important is that
you get the direction correct – you may make the arrow any length, within reason).
c. Calculate the magnitude and direction of the force exerted on a negatively charged fluorine ion (F
– )
placed at point ×. (Hint: save time by using the relationship between field and force.)
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