2. Atoms & Elements

What is the charge of an oxide ion formed when oxygen gains two electrons?

Which noble gas has the same electron configuration as the ion Cl^-?

Which of the following best describes a cation?

Which process leads to the formation of a cation?

Which of the following ions would be colored in aqueous solution?

If calcium ions, each of which has a charge of 2+, are present in a solution, what is the chemical symbol for a calcium ion?

Which of the following best describes a cation?

What charge will chlorine have when it gains one electron?

How do atoms become charged, and how do they balance these charges?

How does sodium become a positively charged ion and chlorine become a negatively charged ion?

What is the net charge of a monatomic ion that has 15 protons and 18 electrons?

What is the name of a positively charged ion?

In the formula NaCl, how many Cl^- ions are present for each Na^+ ion?

Which of the following ions is isoelectronic with Ar?

When are anions formed?