1) 23 Na + ? 23 Na + 1 H 2) 59 Co + 1 n 56 Mn+ ? 3) ? + 2 H 240 Pu + 4) 249 Es +

Question

1)           23Na + ? 23Na + 1H 2)                                 59Co + 1n  56 Mn+ ? 3)          ? + 2H  240 Pu + 4)                    249Es + 1n  161 Gd + 2 1 n+ ? Okay...two questions 1) how do i go about figuring this outjust calculating the missing mass right? andddddddd can someonetell me the difference with the reactions with this by giving 1 example?and 2) i wrote the answersi believe felt right, can someone correct it? like ? + 2H  240 Pu + ? + 2H  240 Pu + 1) i got 1H or 1E i dontknow??? 2) i got 4He 3) 4) i got 87 Sr 1)           23Na + ? 23Na + 1H 2)                                 59Co + 1n  56 Mn+ ? 3)          ? + 2H  240 Pu + 4)                    249Es + 1n  161 Gd + 2 1 n+ ? Okay...two questions 1) how do i go about figuring this outjust calculating the missing mass right? andddddddd can someonetell me the difference with the reactions with this by giving 1 example?and 2) i wrote the answersi believe felt right, can someone correct it? like ? + 2H  240 Pu + ? + 2H  240 Pu + Okay...two questions 1) how do i go about figuring this outjust calculating the missing mass right? andddddddd can someonetell me the difference with the reactions with this by giving 1 example?and 2) i wrote the answersi believe felt right, can someone correct it? like ? + 2H  240 Pu + ? + 2H  240 Pu + 1) i got 1H or 1E i dontknow??? 2) i got 4He 3) 4) i got 87 Sr

Explanation / Answer

sums of atomic number must equal on both sides. Sum of mass numbermust equal on both sides 2) atomic numbers = 27 (Co) + 0 (neutron) = 25 + unknown => unknown's atomic number must be 2     mass number = 59 + 1 = 56 +unknown.    => unknown's mass number must be4. Thus it has 4 total nucleons, but two protons. That is an alphaparticle (helium nucleus) 1) not sure, perhaps neutron and positron. or just a proton, butthen no reaction. Are you sure you copied the questioncorrectly? 2) Done above 3) unknown + 2 = 240 + 0 unknown mass number is 238 unknown + 1 = 94(atomic # of plutonium) + -1 (is this a negative orpositive beta particle) unknown's atomic number is 92, which is uranium uranium-238 4) yes it has a mass number of 87 99 + 0 = 64 + unknown atomic number of unknown = 35 This is bromine So bromine-87

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