Radioactivity — Unit test Answers

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.

This is how sodium appears in the periodic table.

The first model of the atom was developed through

Which determines the reactivity of an alkali metal?

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?

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.

Which argument best explains the charge of an atomic nucleus?

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?

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?

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

Which element is most likely to be shiny?

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

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

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

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