19 Which equation is balanced?
A 3 P4+1 O2 --> 2 P203
B 1 P4+3 02 ---> 2 P203
1 P4+1 02 ---> 2 P203
D 1 P4+ 2 02 ---> 3 P203

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: