What are particles of carbon that enter the air when wood or coal are burned?

What is the nature of the ca-cl bond in a molecule of calcium chloride (cacl2) if the electronegativity value of calcium is 1.0 and that of chlorine is 3.16?

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

Identify the electromagnets with poles that are reversed from the electromagnet shown above