What is the mass of an atom that contains two positively charged nuclides, and two neutrally charged nuclides? What is the atom?

Answer 1

Well, the conventional helium NUCLEUS comprises 4 massive particles.....

Atomic mass is to a very good first approx. NUCLEAR mass, i.e. the number of massive nuclear particles. The helium nucleus has 2 protons, 2 positively charged, massive particles, #Z=2#, and this is what defines the nucleus as helium. The common helium isotope also contains 2 neutrons to give #""^4He#. Capisce?

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Answer 2

Jeremiah Adams

The atom you are referring to is helium (He). The mass of a helium atom containing two positively charged nuclides (protons) and two neutrally charged nuclides (neutrons) is approximately 4 atomic mass units (amu).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.