Proton.
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If you think to a beta particle the symbol is β.
e- is the symbol for an electron, aka a beta particle. It has a unit negative charge.
No, the nuclear symbol for helium is "He" and the symbol for a proton is "p". Helium has two protons in its nucleus, along with two neutrons.
The symbol for an alpha particle is ( \alpha ), and its charge is ( +2e ), where ( e ) is the elementary charge ( 1.6 \times 10^{-19} ) coulombs.
The tau neutrino has mass and is denoted with the symbol μ.