Unit Test — Unit test Answers

Which statement describes a property of a proton?

This is how sodium appears in the periodic table.

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.

A blue circle labeled proton and A overlaps a pink circle labeled electron and C. The overlap is labeled B.

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?

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

Which element has the largest atomic radius?

Which best explains why ionization energy tends to decrease from the top to the bottom of a group?

The first model of the atom was developed through

Who described atoms as small spheres that could not be divided into anything smaller?

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

Which properties make a metal a good material to use for electrical wires?

Which determines the reactivity of an alkali metal?

Which element is most likely to be shiny?

Among the elements of the main group, the general trend in the first ionization energy moving across a period is not followed between group 2 and group 13. Which best explains these exceptions?

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

What did Rutherford’s model of the atom include that Thomson’s model did not have?

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

Which argument best explains the charge of an atomic nucleus?