Which of the following best describes an element? a A substance that cannot be broken down into another substance b Two or more substances together but not chemically combined c A solution salt and water d Two or more different atoms chemically bonded together

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

Asap! will give brainiest when a heat wave strikes a region causing more people to run air-conditioning units, electrical demand increases. what needs to be done to meet this increased demand? raising the control rodslowering the control rodsremoving the control rods