00:01
For this question, they want us to complete the nuclear equations.
00:04
So for part a, we have an unknown plus a neutron, forming two neutrons, plus tc -137, plus zr -97.
00:24
So in order to find what's missing, all we need to know is that the sum of the atomic number on both sides must be equal to each other, and the sum of the atomic mass on both sides must be equal to each other.
00:35
So the first thing that we can do is determine the atomic number of tc and zr.
00:40
And when we look at the pr table, we see that is 43 for tc and that is 40 for zr.
00:46
So now let's balance out the atomic number and get mass.
00:50
So for the left side so far we have zero.
00:53
For the right side, we have zero from the neutron.
00:56
We have 43 from tc and we have 40 from the r.
00:59
So we must add 83 onto the left side.
01:02
So we put 83 here and when we look like the periodic table, we see that as b i.
01:08
As for the mass, we have one on the left.
01:11
We have two on the right from the neutrons.
01:14
So each neutron has a massive one.
01:16
Since we have two of them, we put two here, plus 137 plus 97, right? that is equal to 234.
01:25
So we need to, no, that is equal to 235.
01:28
So we need to add, no, 236, so we need to add 235 to the left.
01:35
Side, 235.
01:39
Now for the second part, we have ti -45 forms an unknown plus a positron.
01:55
So for the atomic number of ti, we can look at the prr table and we see that is 22.
02:02
So we put 22 on the left.
02:04
Now for the right, so far we have one.
02:06
So we need to put 21...