
Concept explainers
(a)
Interpretation:
The element having the electron configuration [He]2s22p2 is to be identified.
Concept introduction:
Electronic configuration represents the arrangement of electrons in an atom. The sublevels are filled according to their increasing energy. The electrons are firstly filled into the sublevel having the lowest energy. The sublevel closest to the nucleus has the lowest energy. The trend of filling of electrons according to the energy of sublevels is given below.
1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s
The electronic configuration up to the electronic configuration of the last noble gas is represented with the symbol of noble gas in square brackets. This notation is known as core notation.

Answer to Problem 46E
The element having the electron configuration [He]2s22p2 is carbon.
Explanation of Solution
The given electron configuration is [He]2s22p2. This gives total number of electrons as the sum of electrons in helium (2), 2 electrons in sublevel 2s and 2 electrons in shell 2p which is equivalent to 6. The atomic number of an element is equivalent to the number of electrons or protons. Therefore, the atomic number of element having configuration [He]2s22p2 is 6.
The element having atomic number 6 is carbon.
Therefore, the element having the electron configuration [He]2s22p2 is carbon.
The element having the electron configuration [He]2s22p2 is carbon.
(b)
Interpretation:
The element having the electron configuration [Ne]3s23p5 is to be identified.
Concept introduction:
Electronic configuration represents the arrangement of electrons in an atom. The sublevels are filled according to their increasing energy. The electrons are firstly filled into the sublevel having the lowest energy. The sublevel closest to the nucleus has the lowest energy. The trend of filling of electrons according to the energy of sublevels is given below.
1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s
The electronic configuration up to the electronic configuration of the last noble gas is represented with the symbol of noble gas in square brackets. This notation is known as core notation.

Answer to Problem 46E
The element having the electron configuration [Ne]3s23p5 is chlorine.
Explanation of Solution
The given electron configuration is [Ne]3s23p5. This gives total number of electrons as the sum of electrons in neon (10), 5 electron in sublevel 3p and 2 electrons in sublevel 3s which is equivalent to 17. The atomic number of an element is equivalent to the number of electrons or protons. Therefore, the atomic number of element having configuration [Ne]3s23p5 is 17.
The element having atomic number 17 is chlorine.
Therefore, the element having the electron configuration [Ne]3s23p5 is chlorine.
The element having the electron configuration [Ne]3s23p5 is chlorine.
(c)
Interpretation:
The element having the electron configuration [Ar]4s23d104p3 is to be identified.
Concept introduction:
Electronic configuration represents the arrangement of electrons in an atom. The sublevels are filled according to their increasing energy. The electrons are firstly filled into the sublevel having the lowest energy. The sublevel closest to the nucleus has the lowest energy. The trend of filling of electrons according to the energy of sublevels is given below.
1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s
The electronic configuration up to the electronic configuration of the last noble gas is represented with the symbol of noble gas in square brackets. This notation is known as core notation.

Answer to Problem 46E
The element having the electron configuration [Ar]4s23d104p3 is arsenic.
Explanation of Solution
The given electron configuration is [Ar]4s23d104p3. This gives total number of electrons as the sum of electrons in argon (18), 10 electrons in sublevel 3d, 3 electrons in sublevel 4p and 2 electrons in sublevel 4s which is equivalent to 33. The atomic number of an element is equivalent to the number of electrons or protons. Therefore, the atomic number of element having configuration [Ar]4s23d104p3 is 33.
The element having atomic number 33 is arsenic.
Therefore, the element having the electron configuration [Ar]4s23d104p3 is arsenic.
The element having the electron configuration [Ar]4s23d104p3 is arsenic.
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Chapter 11 Solutions
Introductory Chemistry: An Active Learning Approach
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