Item Mohs Hardness

fingernail 2.5

penny 3

knife 5.1

steel nail 6.5

You have found the mineral shown in the picture. A knife won’t scratch it, but a nail will.

Describe at least four properties that would help you identify the mineral.

In which of the following belong to a category called the main group of elements? nonmetals. transition elements. halogens. alkali metals. it can be more than one answer!

What diagram shows the ionic compound of magnesium oxide

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.