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Atomic Nucleus

Provides a simplified description of the atomic nucleus.

What is the question?A nucleus of **hydrogen** always has one proton (Z = 1), and in nature, 99.98% of all hydrogen nuclei have 0 neutrons (N = 0). What is the mass number A?
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OK	Value	Feedback
	2	A = N+Z = 0+1 = 1
	0	A = N+Z = 0+1 = 1
	1	Correct!
	-1	A = N+Z = 0+1 = 1

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