What will result from the Alpha decay of (17 8)O?

alpha decay, because alpha particles have two protons and two neutrons.  If the isotope has an atomic number two less than the original, it lost two protons, the same amount as in an alpha particle.

Explanation:

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

let that person have a turn to speak : )