Elements — Unit test Answers

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

This is how sodium appears in the periodic table.

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

Which statement describes a property of a proton?

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

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

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

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?

The first model of the atom was developed through

Which argument best explains the charge of an atomic nucleus?

What are the two parts of an atom?

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

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?

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?