Which best describes arthropods ?
a. spiny skin, water filled veins, an internal symmetry, and tube feet
b. soft-bodied invertebrates with a protective shell and muscular foot
c. jointed body parts, bilateral symmetry, and segmented bodies
d. radial symmetry invertebrates that use stinging cells to capture prey and defend themselves

What is the value of keq for the reaction expressed in scientific notation?

The element that has the greatest electronegativity is

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!