Iwill mark brainliest 1. ) allena and charissa were discussing whether cl2 is an element or a compound. allena said that it is an element because it has only one type of atom. charissa said that it is a compound because it has more than one atom. who is correct? allena is correct. it is an element because it is only one atom. charissa is correct. it is a compound because it has a two. charissa is correct. it is a compound because it is made of more than one atom. allena is correct. it is an element because it is only made of chlorine atoms.2.) when a block of steel at 90 degrees celsius is placed in a bucket of water at 30 degrees celsius, what happens? the temperature of the steel decreases and the temperature of the water increases. the temperature of the steel increases and the temperature of the water increases. the temperature of the steel decreases and the temperature of the water decreases. the temperature of the steel increases and the temperature of the water decreases.3. ) what law states that energy can neither be created nor destroyed, but it is transformed? law of thermal energylaw of thermonuclear energy law of conservation of energylaw of kinetic energy