Can you tell me wether each of these nuclear equations is alpha decay, beta decay, or fusion?

Question

a. Thorium-234--->Proactinium-234 + -1

b. Hydrogen + Hydrogen ---> Helium

c. Uranium-238--->Thorium-234 + Helium-4

Answer 1

a. beta decay (electron or positron is emitted)
b. fusion (nuclear fusion is the process by which multiple nuclei join together to form a heavier nucleus)
c. alpha decay (atomic nucleus ejects an alpha particle through electromagnetic force and transforms into a nucleus with mass number 4 less and atomic number 2 less.

Answer 2

an alpha particle is a helium-4 nucleus. Look for He-4 as a product along with anothe element. (Don't confuse this with a fusion reactions where the ONLY product may be helium. If there is no other "daughter" product then it isn't alpha decay)

a beta (minus) particle is an electrons. Look for an electrons as a product (your equation "a" should have e-1 as a product)

in fusion two smaller nuclei are "fused" into one. Look for two reactants forming one product

Answer 3

1) is beta
2) is fusion
3) is alpha