This is the equation balanced:
<span>BaCl2(aq) + Na2CO3(aq) = BaCO3(s) + 2 NaCl(aq)
Then the coefficient in front of Na Cl is 2.
Answer: 2
</span>
Since the half life of the radioactive isotope is 4,000 years, after 4,000 years the amount of the isotope would decrease by half. (Hence the name, half life.) So, after 4,000 years, there would be half of the isotope left in the fossil.
A) Low ionization energy correlates to elements with fewer valence electrons.
Ionization energy is the energy required to separate valence electrons from their atom. The more valence electrons there are, the higher the ionization energy.
Hope this helps!
A triple beam balance is used to measure mass (grams).
