Atomic Theory — Unit test Answers

The first model of the atom was developed through

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

Which properties are characteristic of metalloids?

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

Which lists only metalloids?

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 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

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?

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

Which determines the reactivity of an alkali metal?

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

Which property do metalloids share with nonmetals?

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?

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

Which element is most likely to be shiny?

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

The table below lists the properties of a metallic element.