The Electron Configurations: Exceptions

Which of the following statements is/are true? i. the electron configuration of silver (Ag) is [Kr] 5s24d9 ii the electrom configuration of selenium (Se) is [Ar] 4s24d104p3 iii the electron configuration of chromium (Cr) is [Ar] 4s13d5 A. i only B. ii only C. iii only D. i and ii E. ii and iii

A comparison of the electron configurations of nickel (Ni) and copper (Cu) indicates that 1. Cu has two more d electrons and the same number of s electrons as Ni. 2. Cu has one more d electron and the same number of s electrons as Ni. 3. Cu has two more d electrons and one less s electron than Ni.  4. Cu has one more d electron and one less s electron than Ni. 5. Cu has one more d electron and one more s electron than Ni.

Which electron configuration is incorrect?a. Zn: [Ar]3d 10 4s 2b. Ca: [Ar]4s 2c. Cr: [Ar]3d 4 4s 2d. Ag: [Kr]4d 10 5s 1e. All the above are correct.

Give the ground-state electron configuration for silicon (Si).Express the complete electron configuration using superscripts where appropriate. For example,the configuration for Li would be entered as 1s22s1. Give the actual ground-stateelectron configuration for copper (Cu).Express the electron configuration using superscripts where appropriate. For example, the configuration for Li would be entered as 1s22s1.  

Use the periodic table to determine each of the following:a. The number of 3s electrons in Mg.b. The number of 3d electrons in Cr.c. The number of 4d electrons in Mo.d. The number of 6p electrons in Pb.

Pd has an anomalous electron configuration. Write the observed electron configuration of Pd.Express your answer in complete form in order of increasing orbital energy. 

Give the actual ground-state electron configuration for copper (Cu).

Determine the element of lowest atomic number that contains a half-filled d subshell in the ground state.

Give the ground-state electron configuration for copper (Cu) using noble-gas shorthand. Express your answer in condensed form as a series of orbitals. For example, [Ar]4s23d8 would be entered as [Ar]4s23d8.An atom consists of a small, positively charged nucleus, surrounded by negatively charged electrons. We organize the electrons in a logical manner. As the atomic number increases, electrons are added to the subshells according to their energy. Lower energy subshells fill before higher energy subshells. The order of filling is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.

a) Give the ground-state electron configuration for silicon (Si).b) Give the actual ground-state electron configuration for copper (Cu).