Unit Test — Unit test Answers

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?

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

The first model of the atom was developed through

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

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

How many atoms of each element are in the chemical formula Ca(OH)2?

"Na2SO3” represents sodium sulfite.What does the 4 mean in the formula 4Na2SO3?

Which determines the reactivity of an alkali metal?

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

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

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?

Which property do metalloids share with nonmetals?

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

Which element is most likely to be shiny?

Which argument best explains the charge of an atomic nucleus?

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?

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

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?

Which properties are characteristic of metalloids?