I'm pretty sure the answer is the first one. The fact that it doesn't have a full valence shell means that electrons from other atoms can react and bond with the sodium atom.
Hope this helps x
<span>Similarities:
-Physical properties can be observed or measured without changing the composition of matter.
-Physical properties are used to observe and describe matter.
</span><span>Differences;
-Chemical properties are only observed during a chemical reaction and thus changing the substance's chemical composition.
</span>
If this helped and you have any other questions, feel free to comment on my wall. Hope this helped.
Answer:
Beta Particals
Explanation:
Beta particles are lighter than alpha particles, and they have a greater ability to penetrate other materials. A thin sheet of metal or plastic or a block of wood can stop beta particles.
The atomic number for oxygen is 8.