Which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

Matches the chemical name of each oxide of phosphorus to its chemical formula

Name the element in group 17, period 2. (periodic table)

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.