salacties and stalagmites are formed in a cave due to deposition of carbonates when temporary hard water evaporates, please help me I will mark u brainlist true or false

How do the energy differences between the higher energy levels of an atom compare with the energy difference between the lower energy level of the atom

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided