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A hydrogen nucleus (a proton) has a charge of +1, and a helium nucleus has a charge of +2. Why, then, does it require four protons to form helium in the core of the Sun?
Criteria
Standards or principles by which something is judged or decided.
Poverty
A state where an individual or community lacks the financial resources and essentials for a minimum standard of living.
Two-Year Period
A span or duration of time lasting exactly 24 months or two calendar years.
Low-Income Cutoffs
Thresholds of income set by statistics agencies, below which a family or individual is considered to be living in poverty.
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