2. Atoms & Elements

One isotope of a metallic element has a mass number of 65 and 35 neutrons in the nucleus. The cation that this atom forms has 28 electrons. What is the symbol of the cation?

Fill in the gaps for the following table.

In which pair are the two species both isoelectronic and isotopic?

In ionic compounds, ________ lose their valence electrons to form positively charged ________.

What charge would an ion that has 11 protons, 11 neutrons, and 10 electrons would have?

Which of the following is the symbol for the ion with a +4 charge, 30 neutrons and 21 electrons?