Unit Test — Unit test Answers

What trend does the reactivity of most nonmetals show in a periodic table, excluding the noble gases?

Which properties are characteristic of metalloids?

Which property do metalloids share with nonmetals?

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?

Which element is most likely to be shiny?

The first model of the atom was developed through

Which argument best explains the charge of an atomic nucleus?

Who is known as the "father of modern chemistry” because he first organized all known elements into four different groups?

Cecil is working with samples of chlorine (Cl), oxygen (O), bromine (Br), and silver (Ag). The samples are all at room temperature. Which substance is most likely the most dense?

Atom A and Atom B have the same number of protons, but they do not have the same number of neutrons.Which statement describes these atoms?

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?

Which statement describes a property of a proton?

The table below lists the properties of a metallic element.

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

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.

An atom of the element zinc has an atomic number of 30 and a mass number of 65. How many protons does an uncharged zinc atom have?

What are the two parts of an atom?

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

The elements least likely to form bonds are found in which group?

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