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If an element has atomic number 9 and atomic mass 19, how many neutrons will it have?

Answer 1

TEN neutrons.........

To an excellent approximation, atomic mass is equivalent to nuclear mass; i.e. the combined mass of neutrons and protons. Can you tell us the identity of the nuclide? You have all the info necessary to do so.

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Answer 2

Ellie Andrews

10 neutrons.

We know that Mass number #~~# Atomic mass of an atom(as electrons weigh almost nothing relative to an atom, although each of them have mass of #9.11 * 10^-34# kg. ); Mass Number = Number of Protons + Number of Neutrons; And Atomic Number = Number of Protons.

So Number of Neutrons = Atomic Mass - Atomic Number = 19 - 9 = 10 This explains the answer.

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Answer 3

Cameron Andrews

By deducting the atomic number from the atomic mass, one can determine the number of neutrons in an atom: number of neutrons = atomic mass - number of neutrons = 19 - 9 number of neutrons = 10

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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.