18. what element has 81 protons in the nuclei of its atoms?

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate