QQuestionChemistry
QuestionChemistry
Calculate the number of electrons, protons, and neutrons in the Argon atom whose atomic number is 18 and mass number is 40.
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Answer
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Step 1:: Determine the number of protons, which is the atomic number.
The atomic number of Argon is 18. This means that there are 18 protons in an Argon atom. In symbolic form: \text{Number of protons} = 18
Step 2:: Determine the number of electrons in a neutral Argon atom.
In a neutral atom, the number of electrons is equal to the number of protons. Since there are 18 protons in an Argon atom, there are also 18 electrons. In symbolic form: \text{Number of electrons} = 18
Step 3:: Determine the number of neutrons.
The mass number of an atom is the sum of the number of protons and neutrons. In this case, the mass number is 40, and we already know there are 18 protons. To find the number of neutrons, subtract the number of protons from the mass number: \text{Number of neutrons} = \text{Mass number} - \text{Number of protons} \text{Number of neutrons} = 40 - 18 \text{Number of neutrons} = 22
Final Answer
- Number of electrons in an Argon atom: 18 - Number of protons in an Argon atom: 18 - Number of neutrons in an Argon atom: 22
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