The diagram shows the electronic structure of an atom. What type of particles are represented by the crosses?

Answer:
electrons are represented by the crosses
Explanation:
The rings represent electron shells. The outermost electrons are called valence electrons. Valence electrons are used during bonding.
Answer:
electrons
Explanation:
The red dot in the center is the nucleus and it has protons and neutrons.
Since it has 12 electrons this means (if it is a neutral atom and not an ion) it will have 12 protons which makes it a magnesium atom.