Do You Know Chromium?

Explanation
The correct answer is Group 6 because it is stated that "It is the first element in..." and Group 6 is the first group mentioned in the list.

Explanation
Chromium was discovered as an element after it came to the attention of the Western world in the red crystalline mineral crocoite (lead(II) chromate), discovered in 1761.

Explanation
Chromium minerals as pigments came to the attention of the West in the 18th century. This suggests that prior to the 18th century, the use of chromium minerals as pigments was not known or widely used in Western countries. The discovery and recognition of the pigments in the 18th century would have likely led to their subsequent use and popularity in various industries such as art and manufacturing.

Explanation
Chromium is ranked 22nd among the most abundant elements in Earth's crust with an average concentration of 100 ppm.

Explanation
Chromium was discovered in 1797. This is the correct answer because it is the only option provided that matches the year of discovery.

Explanation
The correct answer is 7.19 g cm-3. This implies that the density of the substance being referred to is 7.19 grams per cubic centimeter.

Explanation
Chromium is classified as a transition metal. Transition metals are elements that have partially filled d or f orbitals in their electron configuration. They are known for their ability to form multiple oxidation states and their characteristic metallic properties. Chromium exhibits these properties and is commonly used in various industrial applications, such as in the production of stainless steel and other alloys.

Explanation
The oxidation states of an element refer to the charge that it carries when it forms a compound or ion. In this case, the element in question has oxidation states of +2, +3, and +6. This means that it can lose 2, 3, or 6 electrons to form compounds or ions with different charges.

Explanation
The correct answer is 28. The question is asking for the number of neutrons an atom has. Neutrons are subatomic particles with no charge, found in the nucleus of an atom. To determine the number of neutrons, you subtract the atomic number (which represents the number of protons) from the atomic mass. In this case, since the question does not provide any additional information, we assume the given numbers are atomic masses. Therefore, the atom in question has 28 neutrons.

Explanation
Approximately 75-85% of the chromium that is commercially produced is used to make alloys, such as stainless steel. This indicates that a significant majority of the chromium production is dedicated to alloy production, highlighting the importance of chromium in the manufacturing of stainless steel and other alloys.