Based on the characteristics you've provided, we can categorize helium (He) gas particles and discuss the types of matter:
-
Can be represented using chemical symbols: Helium is represented by the chemical symbol "He."
-
Can have subscripts in their chemical formulas: While helium itself is a noble gas (an element) and is diatomic or monoatomic, when mixed with other elements, compounds involving helium could theoretically have subscripts if we were to represent them in a formula. However, pure helium as an element does not involve subscripts.
-
Are represented on the periodic table: Helium is indeed represented on the periodic table as element number 2.
-
Are always made of two or more atoms: Helium is a monatomic gas, meaning it consists of single atoms (not bonded with others to form molecules).
-
Describe helium (He) gas particles: Helium gas particles are individual He atoms, which are colorless, odorless, non-toxic, and lighter than air.
Types of Matter
- Atoms: The basic units of matter; helium as He represents a single type of atom.
- Elements: Pure substances that consist of only one type of atom; helium is an element.
- Molecules: Combinations of two or more atoms; helium in its pure state does not form molecules, as it exists as single atoms.
- Compounds: Substances formed when two or more different elements combine; helium does not form compounds under normal conditions; it remains as a noble gas.
In summary, helium fits the definition of an element, and is categorized as a type of matter that exists as a single atom rather than a molecule or compound.