The average Kenectic energy
Answer:
A
Explanation:
Sodium has 11 electrons and Magnesium has 12 electrons. Since here you need to consider atoms, they must have equal amount of protons as electrons to be considered neutral, and so an atom.
So simply 11+12 =23
Answer: the statement that is not true is the second one: <span>It only occurs in very small atoms with low mass.
Explanation:
</span><span>The nuclear fission consists in the division or fragmentation of an atomic nuclei into smaller fragments releasing huge amounts of energy.
The biggest and heaviest atoms are unstable, meaning that they gain stability by splitting into smaller, lighter atoms.
So, the third given statement contradicts the previous fact.
That is why most of the heaviest elements have not been found naturally but have been created synthetically and have very short life times.
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