Over half of retirees (55 percent) in the highest income quintile had retirement accounts that provided them with a median of $30,000 in 2012, compared with just 5.2 percent of people in the lowest income quintile who received a median of $2,400.
The ions are Sn2+ and Br-, so the formula is SnBr2. Edit. Share to: 1  The Periodic Table of Elements Life is sustained by a number of chemical elements. 2  They are responsible for the birth of planets and the evolution of cells to complex organisms.
In your case, the atom is said to contain eight protons nine neutrons -> they do not influence the net charge of the atom ten electrons Now, electrons and protons carry opposite charges. A proton is said to carry a 1+ charge, while an electron is said to carry a 1-. In your case, you have 8 protons and 10 electrons. This means that the atom will carry a total 2 xx (1-) = 2- net charge. Therefore, you are dealing with an anion that carries a 2- net charge, i.e. it has two more electrons than it does protons.