Identify the particle represented by each symbol as an alpha particle, a beta particle, a gamma ray, a positron, a neutron, or a proton. a. 11P
b. 42He
c. +10e

is symbol for proton emission in the nucleus.

symbolises alpha emission, equivalent to helium atom emission of a radioactive particle

is the radiation symbol for positiron particle. which occurs when beta + radioactive decay occurs

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.