Practice Electron in Chemistry
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A negatively charged particle found outside the nucleus, occupying energy shells around the atom.
The particles that do the 'dancing'—they're what's involved in bonding and reactions.
Example 1
easyWrite the electron configuration for oxygen (Z = 8).
Example 2
mediumA chlorine atom (Z = 17) gains one electron. Write the electron configuration of the resulting \text{Cl}^- ion and explain why chlorine tends to gain an electron.
Example 3
easyHow many electrons does a neutral atom of magnesium (Z = 12) have? Write its electron configuration.
Example 4
mediumWhich subatomic particle is mainly responsible for chemical bonding, and why?