Answer is b hope this helps
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
He started to observe, reconnoiter means to make a military observation of something so he throughly examined the corridors.
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Pandemic: prevalent over a whole country or the world.
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