Explain why an atom with 7 valence electrons and 2 energy levels has a high electronegativity and ionization energy.

What effect might melting sea ice have for people who live in coastal areas?

How many valence electrons are in atom of radon?

What are the advantages of using the metric system? designed as a decimal system making conversions simpler more accurate system of measurement has prefixes that correspond to an amount to use with all base units used by the entire scientific community