Exam 2: Atoms, Ions, and Molecules: Matter Starts Here

The mass of thallium (Tl) on the periodic table is given as 204.3833 without any units. There are 47 isotopes of thallium, but only two are stable and abundant, thallium-203, with a mass of 202.9723 amu, and thallium-205, with a mass of 204.9744 amu. What is the percentage of each of these isotopes in naturally occurring thallium?

Based on its position in the periodic table, which atom would you predict to form a compound with one chlorine atom?

The formula for a lutetium carbonate compound is Lu₂(CO₃)₃. What would be the formula for a lutetium nitrate compound given that the charge of lutetium is the same in both compounds?

What is the chemical formula for potassium sulfite?

Which stellar nuclear reaction is not correctly written?

Based on its position in the periodic table, which single atom would you predict to form a compound with two nitrate polyatomic ions?

Which one of the following ionic compounds has an incorrect formula or is not named correctly?

Which letter below represents the chalcogen group? A B C D E

Which of the following atoms contains the least number of neutrons?

Which one of the following is an anion?

Elements in group 17 (VIIA) are called ________

What is the correct name for SO₃?

Label the highlighted regions of the periodic table.

Identify the statement regarding H₂, He, and NH₃ that is correct.

What is the symbol of the ion having 12 protons and 10 electrons?

Which statement below is not correct?

Give an example of an alkali metal.

Locate each element in the periodic table and identify which statement is not correct. The common ion of ________ has ________ electrons and a charge of ________.

Which statement is not correct? In atomic mass units (amu or u), ________

Which one of the following experiments provided evidence that atoms contained small massive nuclei with positive charges?