2. Atoms & Elements

Which of the following ions is not isoelectronic with the others?

Which of the following is the correct symbol for the ion with 19 protons and 18 electrons?

When an atom loses an electron to form a cation, which changes occur in both its charge and its radius?

When metals undergo ionization, do they typically form anions or cations?

Which one of the following elements forms two or more ions with different ionic charges?

Which change occurs when a barium atom loses two electrons?

When an atom loses an electron, it becomes a:

What is the charge of the most common ion formed by a sodium (Na) atom?

How many protons are present in an ion that has 18 electrons and a -1 charge?

Which of the following best describes an atom that has lost an electron?

Which statement best describes the difference between an ion and an atom?

Why does sodium readily lose an electron while chlorine readily gains one during the formation of sodium chloride?

Which of the following statements is always true about an anion?

Which of the following elements would you expect to form a cation?

Which of the following pairs of ions represent isoelectronic species?