Which of the following is a pure substance? a. air b. carbon dioxide c. soda d. salt water

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

If it is an isoelectronic series select true, if not select false. o2-, s2-, se2-, te2- na+, k+, rb+, cs+ n3-, p3-, as3-, sb3- ag, cd+, sn3+, sb4+ f-, cl-, br-, i- f-, ne, na+, mg2+ s2-, s, s6+

Find the midpoint of a segment with endpoints of 4-3i and -2+7i