Sorry, no online dictionaries contain the exact phrase number of protons in a helium atom.

Reverse dictionary results:
1. mass number
2. atomic number
3. europium
4. neodymium
5. neptunium
6. praseodymium
7. terbium
8. uranium
9. element
10. neutron
11. bromine
12. fluorine
13. chlorine
14. alpha particle
15. two
16. argon
17. ion
18. astatine
19. iodine
20. nucleon number
21. atomic structure
22. chromium
23. mercury
24. carbon
25. nitrogen
26. proton
27. nuclide
28. multiplicity
29. triplet
30. valency
31. covalence
32. neutron number
33. covalency
34. monatomic
35. neon
36. deuterium
37. isotope
38. oxygen
39. bevatron
40. quark

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