00:01
Okay, this question is exactly similar to last four question, which we have done.
00:08
So i'm going to straightaway jump to the equations.
00:12
Remember, when an atom emits alpha particle, its atomic number decreases by 2, while the mass number decreases by 4.
00:22
So for alpha particles, the decreasing for mass number will be negative 4, while atomic number negative 2.
00:32
Just simply apply this rule.
00:34
So applying this rule for the first problem, we have thorium, which has mass number 2, 32, 90, again going as alpha emission.
00:50
So subtracting mass number by 4, which goes 2 to 8, and atomic number by 2, which equals 88, plus 8, plus 4, 2, helium.
01:04
Again, going towards the next reaction, we have x.
01:21
Yes.
01:22
So in this case, the x represented is by radium.
01:29
Moving on to our second reaction, we have, it's a continuation.
01:35
So we have 2 to 8 radium by 88...