Multiple Choice
Which of the following is the number of electrons in a neutral atom of scandium (Sc)?
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- 1. Intro to General Chemistry3h 46m
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2. Atoms & Elements
The Atom
Multiple Choice
Which element has an atom with the electron configuration 2-5, and how many protons does it contain?
A
7
B
12
C
2
D
5
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Verified step by step guidance1
Understand that the electron configuration 2-5 means the atom has 2 electrons in the first shell and 5 electrons in the second shell.
Calculate the total number of electrons by adding the electrons in each shell: \(2 + 5 = 7\) electrons.
Recall that in a neutral atom, the number of electrons equals the number of protons, so the atom has 7 protons.
Identify the element with 7 protons by referring to the periodic table; the element with atomic number 7 is nitrogen (N).
Conclude that the element with electron configuration 2-5 is nitrogen, and it contains 7 protons.
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