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Alex73 [517]
3 years ago
11

An atom of a certain element has 19 protons, 19 electrons, and a mass number of 39. This element is very reactive. How many neut

rons are in this atom?
Chemistry
1 answer:
gogolik [260]3 years ago
6 0

Answer:

There would be 20 neutrons in that atom.

Explanation:

The mass number of an atom is the sum of:

  • the number of neutrons in this atom, and
  • the number of protons in this atom.

Electrons do not contribute to the mass number of an atom.

From the question:

  • Mass number of this atom: 39.
  • Number of protons in this atom: 19.

(\text{Mass Number}) = (\text{Number of protons}) + (\text{Number of neutrons}).

In this atom:

39 = 19 + (\text{Number of neutrons}).

Hence, the number of neutrons would be 39 - 19 = 20.

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