How does an S2-ion differ from an electrically neutral Sulfur atom? 1) Atomic number

2)Number or electrons

3)Mass number

4)Nuclear charge

Answer-ide.

The answer is just took the test

3-isopentane; 3-methylbutane, and 1,2-methylpropane do not meet iupac rules, so they are wrong names.the only valid name onthe list is 2-methylbutane, which is the same isopentane.this is its formula:                   ch2                    |ch3 - ch - ch2 - ch3answer: 2-methylbutane