Shown are ball-and-stick (1) and space-filling (2) models of methane. 
-What is the H-C-H bond angle?
Definitions:
Alphabet
Alphabet is a set of letters or symbols in a fixed order used to represent the basic sounds of a spoken language.
Cognitive Development
The study and description of how a person's thought processes develop from childhood through adulthood.
Water
A transparent, tasteless, odorless, and nearly colorless chemical substance that is the main constituent of Earth's hydrosphere and the fluids of most living organisms.
Glass
A hard, brittle, transparent solid material made by cooling melted ingredients such as silica, often used in windows, bottles, and many other applications.
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