What is the geometry around the central atom in the following molecular model of NH4+? 
Definitions:
Recall
The act of retrieving information or events from the past in one's memory.
Nonsense Syllables
Random strings of letters without inherent meaning, often used in memory and learning experiments to study the processes of human cognition.
Ebbinghaus
Refers to Hermann Ebbinghaus, a psychologist known for his research on memory, specifically the forgetting curve and the spacing effect.
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A type of question or survey format that presents respondents with several answers and requires them to select the correct one.
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