Calcium has 2 valence electrons
The shape is connected in parallel so;
5.1) Ans;

5.2) Ans;

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The change in momentum of an object equals the impulse applied to it
Answer:
i think..its fraction that its have multiple fractions on it..if you minus the 397 000-355 it should be 381+ so i say if you get the 5 multiply it by 9!! so you will get it!
Explanation:
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