The average atomic mass of an element does not account for naturally occurring isotopes.
True
False

What are transitions between a liquid and gas called? identify which way they are transitioning

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+

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas