Brief Instructions An electron configuration is a method of indicating the arrangement of electrons about a nucleus. A typical electron configuration consists of numbers, letters, and superscripts with the following format:

1. A number indicates the energy level (The number is called the principal quantum number.).

2. A letter indicates the type of sublevel/orbital; s, p, d, f.

3. A superscript indicates the number of electrons in the orbital. Example: ls2 means that there are two electrons in the ‘s’ orbital of the first energy level. The element is helium.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm

How do all types of diffusion/passive transport actually ‘work’ without using even the smallest amount of cellular energy?