¹⁹⁴Pt
Explanation:
If osmium-190 (76 protons) is hit with an alpha particle (He²⁺, 2 protons) platinum-194 (78 protons) is formed.
The nuclear reaction (other subatomic particles my be formed):
¹⁹⁰Os + ⁴He → ¹⁹⁴Pt
Learn more about:
nuclear reactions
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