How reactive is an atom of Sodium (na) and why?

1 answer:

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The water and sodium first combine, the sodium releases electrons — negatively charged particles — leaving the element in a positively charged state All those positive charges repel each other, tearing the sodium apart and creating more surface area for an even bigger reaction: ka-boom.

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This must me the isotope of an element with an atomic mass close to 69 u.
The only candidates are Zn and Ga.
Zn has a zinc-69 isotope with mass 68.926 u.
Ga has a gallium -69 isotope with mass 68.925 u.
The isotope is probably $_{30} ^{69}Zn$ .
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