Another Empty Element Is Hr,the Horizontal ____ Element,which Marks a Major

question 54

Multiple Choice

Another empty element is hr,the horizontal ____ element,which marks a major topic change within a section.

• A) line
• B) rule
• C) space
• D) row

---

Definitions:

Potassium

A soft silvery metal with the symbol K and atomic number 19, essential for life, particularly in nerve function.

Lewis Dot Structure

A visual representation of the valence electrons of an atom, ion or molecule, using dots around symbols of elements.

Selenium (Se)

A nonmetal element with atomic number 34, vital in small amounts for cellular function in many organisms, and utilized in various industrial applications.

Alkane

Hydrocarbons with the general formula CnH2n+2, consisting only of single bonds and saturated with hydrogen.