How many species are known to be living on Earth?

How can you use chemical equations to predict the products of the reaction you can carry out?

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

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