Which word or group of words is represented by the word "period”in the term periodic table?

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what

Can someone i have no idea of how to do this.

Asample of digestive juice was removed from the stomach of a pig. the juice was placed in a test tube along with some grains of wheat. a second test tube was set up containing an equal number of wheat grains, with distilled water rather than digestive juice. the test tubes were kept for 8 hours at 40 degrees c. after 8 hours, the grains inside the digestive juice had broken into tiny particles. the grains of wheat, in the water, were wet but otherwise unchanged. what is the control group?