Sonya reads the element riddle below. i am shiny. i form +1 ions. there’s more! i am the most reactive metal in period 4. who am i? which element is the answer to the riddle? krypton potassium sodium bromine

What are the student's observations and inferences before he starts his investigation?

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million