Question

question 4 (1 point)
listen
which of the following has been stated correctly?

1. ionic bonds are formed only between metal and non - metal
2. forces of energy of energy that hold two or more atoms together and make them function as one unit are called electron affinity
3. br⁻ ion will have the electronic configuration of ar
4. k⁺ ion will have the electronic configuration of kr

Explanation:

1. Ionic bonds can also form between poly - atomic ions where non - metals are involved in both ions, so this is incorrect.
2. The forces that hold atoms together are chemical bonds, not electron affinity. Electron affinity is the energy change when an electron is added to a neutral atom in the gaseous state, so this is incorrect.
3. Bromine (Br) has an atomic number of 35. The Br⁻ ion has 36 electrons, which is the same as the number of electrons in argon (Ar) which has an atomic number of 18, so this is correct.
4. Potassium (K) has an atomic number of 19. The K⁺ ion has 18 electrons, which is the electronic configuration of argon (Ar), not krypton (Kr) which has 36 electrons, so this is incorrect.

Answer:

1. Br⁻ ion will have the electronic configuration of Ar