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Atomic Nucleus

Provides a simplified description of the atomic nucleus.

What is the question?A nucleus of hydrogen always has 1 proton, but various forms of hydrogen – called isotopes – are possible. For example, hydrogen-2 (or H-2, otherwise known as deuterium) has 1 neutron. What is the mass number A for this isotope of hydrogen?
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OK	Value	Feedback
	3	A = N+Z = 1+1 = 2
	2	Correct! A = N+Z = 1+1 = 2
	0	A = N+Z = 1+1 = 2
	1	A = N+Z = 1+1 = 2

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