Answer:

Explanation:
1. Calculate the decay constant
The integrated rate law for radioactive decay is 1

where
A₀ and A_t are the counts at t = 0 and t
k is the radioactive decay constant

2. Calculate the half-life

The half-life for decay is
.
The metalloid that has three valence electrons is Boron~
Answer:
2 atoms of aluminium makes a molecule of aluminium
On a molecular level there is a lot of movement which in turn is the reason why heat is generated.