Unit Test — Unit test Answers

Which statement describes a property of a proton?

Jerome is learning how the model of the atom has changed over time as new evidence was gathered. He has images of four models of the atom, but they are not in the correct order.In what order should Jerome put these models to show the development from the earliest model of the atom to the most recent one?

The table below lists the properties of a metallic element.

While looking at xenon (Xe) on the periodic table, a student needs to find an element with a smaller atomic mass in the same group. Where should the student look?

When an atom that has no charge loses two electrons, it becomes a

Scientists in a lab are working with two different samples of the element mercury. They know that the different samples are different isotopes.

The elements in group 17 of the periodic table are all called halogens. All halogens have the same

Which property do metalloids share with nonmetals?

Which lists the elements in order from most conductive to least conductive?

What are the two parts of an atom?

Joelle is a manager at a construction company, and she is interested in the chemistry behind the materials they use. She has begun studying the materials used to fill walls. She knows that to keep the temperature inside a room steady the material must be a thermal insulator, and she predicts that materials should not be acidic or else they would dissolve too easily in water.

Which determines the reactivity of an alkali metal?

The first model of the atom was developed through