Understanding Atomic Structure and Chemical Composition

This page provides a comprehensive overview of fundamental chemistry concepts and particle classifications. The content explores essential definitions and measurements in atomic structure.

Definition: An atom is the simplest particle of an element that can exist independently in a stable environment.

Definition: A molecule consists of two or more atoms joined through chemical bonding, regardless of whether the atoms are identical or different.

Vocabulary: Elements are pure substances containing only one type of atom, while compounds form when different elements combine chemically.

Example: Mixtures differ from compounds as they contain substances that are combined physically and can typically be separated easily.

Highlight: The atomic radius measures approximately 0.1 nanometers (1 × 10⁻¹⁰ meters), while the nucleus radius is roughly 1/10,000th of the atom's size (1 × 10⁻¹⁴ meters).

Highlight: The page includes important metric prefixes:

• Giga (G): 10⁹
• Mega (M): 10⁶
• Kilo $k$: 10³
• Milli $m$: 10⁻³
• Micro (μ): 10⁻⁶
• Nano $n$: 10⁻⁹

Definition: Subatomic particles have distinct properties:

• Protons: Positive charge, relative mass of 1
• Neutrons: Neutral charge, relative mass of 1
• Electrons: Negative charge, relative mass of 1/1840