Here's a breakdown:
* Atoms are the basic building blocks of matter and have a neutral charge, meaning they contain an equal number of positively charged protons and negatively charged electrons.
* Electrons are negatively charged particles that orbit the atom's nucleus.
* Ions are formed when atoms gain or lose electrons.
* Positively charged ions (cations) are formed when an atom loses one or more electrons, leaving it with more protons than electrons, resulting in a net positive charge.
Examples of positively charged ions:
* Sodium ion (Na+): A sodium atom loses one electron to become a sodium ion with a +1 charge.
* Calcium ion (Ca2+): A calcium atom loses two electrons to become a calcium ion with a +2 charge.
* Aluminum ion (Al3+): An aluminum atom loses three electrons to become an aluminum ion with a +3 charge.
Key points to remember:
* Cations are formed by the loss of electrons.
* Cations have a net positive charge.
* Cations are essential for various biological processes, including nerve impulse transmission and muscle contraction.
