contestada

DONT HAVE MUCH TIME 4 MIN
21. The number of protons in an element is called the _______________ number.
22. Irene Curie used ___________________ as the source of alpha particles for her research.
23. Uranium goes through _____________ decay ____________ (a number) times to produce
Plutonium.
24. ________________ is a raw Uranium ore which was central to the discovery of radioactivity.
25. The ____________________ was cited in the letter signed by Einstein as having ore with
high concentrations of U-235.

Respuesta :

Answer:

21. A to m i c number

22. P o l o n i u m

23. N e p t u n i u m -239, I don't know the second one

24. U r a n i n i t e

25. M a n h a t t a n Project

Explanation:

These are just my guesses, So some of them might not be correct.