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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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Answer:

V2 = 17371.43ml

Explanation:

We use Boyles laws

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P1V1=P2V2

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4 0
3 years ago
Sodium bicarbonate is the chemical name for baking soda.Its chemical formula is NaHCO3.What does the subscript 3 mean?
prisoha [69]

Answer:

3 moles of Oxygen

Explanation:

The chemical formula of a compound is a representation which shows all the elements therein and the mole relationship between them expressed as subscripts.

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     1 mole of Na

     1 mole of Hydrogen

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3 years ago
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pochemuha

Answer:

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A) Earlier you were told that of all of the 14 solutes you will be studying, the only one that is not appreciably ionized in wat
lidiya [134]

Answer:

Throughout the overview section following portion, the description and according to particular circumstance is defined.

Explanation:

As per the question,

⇒ NH_3(aq)+H_2O\leftrightarrow NH_4+(aq)+OH-(aq)

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3 years ago
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Mumz [18]

Explanation:

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