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Toss Up - Chemistry - Multiple Choice

The most common isotope of hydrogen has
W) 1 neutron and 1 electron.
X) 1 proton and 1 electron.
Y) 1 proton, 1 neutron, and 1 electron.
Z) 2 protons and 2 electrons.

ANSWER: X) 1 PROTON AND 1 ELECTRON