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Ionization energy increases going down a group.
Arousal Theory
A theory suggesting that people are motivated to maintain an optimal level of arousal, which varies from one individual to another.
Maslow's Hierarchy
A theory in psychology proposed by Abraham Maslow that presents a hierarchy of human needs, from basic physiological needs to self-actualization.
Plutchik's Scheme
A psychoevolutionary theory of emotion, proposing eight primary bipolar emotions and their combinations, interactions, and variations.
Primary Drive
Basic, innate urges such as hunger and thirst that motivate behavior to satisfy physiological needs.
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