19. This type of bond involves the bonding of two ions of opposite charges A. Covalent bond
B. Hydrogen bond
C. Polar covalent bond
D. None of the above

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

Which fact represents evidence for the big bang theory?

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?