Which of the following describes an exothermic reaction?
O
A. AHI, reactants = 0
O
B. AHf, reactants = AHf, products
O
C. A He, reactants > AHf, products
O
D. A He, reactants < AH, products

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Name the element in group 17, period 2. (periodic table)

Which of the following is a conclusion that resulted from ernest rutherford’s scattering experiment? (will mark brainliest) a. the nucleus is negatively charged b. the atom is a dense solid and is indivisible c. the mass is conserved when atoms react chemically d. the nucleus is very small and the atom is mostly empty space