hard nuclide decay q (destroyer)

[Tina324]

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A nuclide Th (atomic mass=225 and atomic number=90) underwent 3 alpha decays, 4 beta decays, and a gamma decay. WHat is the resulting nucleus?

answer=Ra which has an atomic number of 88!!

shouldn't the answer be Hg?

 

[Mista E]

beta decay raises atomic number by 1

 

[doc3232]

A nuclide Th (atomic mass=225 and atomic number=90) underwent 3 alpha decays, 4 beta decays, and a gamma decay. WHat is the resulting nucleus?

answer=Ra which has an atomic number of 88!!

shouldn't the answer be Hg?

213 88
subtract 225 by 3x4 and 90 by 3x2
then for the beta just add one for each beta decay like previous poster said
the gamma will become like X + gamma radiation--> X*
just means unstable.

 

[nixon13]

A nuclide Th (atomic mass=225 and atomic number=90) underwent 3 alpha decays, 4 beta decays, and a gamma decay. WHat is the resulting nucleus?

answer=Ra which has an atomic number of 88!!

shouldn't the answer be Hg?

Alpha decay= -4 on the atomic mass and -2 on the atomic number.
So starting at 225 you would end up wiht 213 atomic mass and 84 atomic number. Then it went 4 beta decays. Beta= +1 atomic number. So it went from 84 to 88. gamma decay doesnt do anything. So you determine an element by its atomic number not its atomic mass and so if you go on the periodic table, 88 refers to Ra.