Metalloids — Unit test Answers

Which determines the reactivity of an alkali metal?

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

What are the two parts of an atom?

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

Which statement describes a property of a proton?

Which property do metalloids share with nonmetals?

The table below lists the properties of a metallic element.

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

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.

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?

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?

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

The first model of the atom was developed through

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?

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?

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

This is how sodium appears in the periodic table.

Which element is most likely to be shiny?