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4.all of the following are assumptions presented by dalton's atomic theory except that
a. all atoms of different elements are alike in size, shape, and weight.
b. all matter consists of atoms.
c. atoms combine with other atoms.
d. atoms don't break into pieces even during chemical reactions.

10. with regard to the ph scale, a solution with a ph
a. lower than 7 is considered basic.
b. close to 14 is considered a strong base.
c. of 6 is considered neutral.
d. higher than 7 is considered an acid.

18. which of the following is a benefit associated with nuclear energy?
a. radiation utilized in fertilizer production
b. radiophosphorous used in dental treatment
c. radioisotopes used as tracers in industry
d. radiation exposure and waste leakage

20. which of the following is accurate in describing the placement and classification of iodine?
a. iodine is located in period 5, group 17 and is classified as a nonmetal.
b. iodine is located in period 17, group 5 and is classified as a nonmetal.
c. iodine is located in period 7, group 6 and is classified as a metal.
d. iodine is located in period 6, group 7 and is classified as a metal.