Which of the following statements about transition metals is true?
a. they are never found uncombined in nature.
b. they include familiar metals such as gold, silver, copper, and nickel.
c. they are so soft that they can be cut with an ordinary knife.
d. they are the most reactive of all the types of metals.

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Iknow #2 is d. i just need to know why

An atom of lithium (li) and an atom of chlorine (cl) engage in a chemical reaction. which correctly describes the structure of the resulting chemical compound? hint: consider the class of each element. the chemical compound will have a network structure. the chemical compound will have triple bonds. the chemical compound will have a ball-and-stick structure. the chemical compound will have double bonds.