Which one of the following statements is/are true? 1. Selenium (Se) has the electron configuration [Ar]4s 2 4d 10 4p 3 2. Silver (Ag) has the electron configuration [Kr] 5s 1 4d 10 3. Chromium (Cr) has the electron configuration [Ar] 4s 1 3d 5

10. Periodic Properties of the Elements - Part 1 of 3

10. Periodic Properties of the Elements / The Electron Configurations: Exceptions / Problem 8

Problem 8

Which one of the following statements is/are true?
1. Selenium (Se) has the electron configuration [Ar]4s²4d¹⁰4p³
2. Silver (Ag) has the electron configuration [Kr] 5s¹4d¹⁰
3. Chromium (Cr) has the electron configuration [Ar] 4s¹3d⁵

1 only

2 only

3 only

1 and 2 only

2 and 3 only

1 and 3 only