Write the ground-state electron configurations of the following ions. (a) li+ (b) n3− (c) in3+ (use the noble gas core electron configuration in your answer.) (d) tl+ (use the noble gas core electron configuration in your answer.)

Stion 13 of 20 : select the best answer for the question. 13. if a certain mass of mercury has a volume of 0.002 m3 at a temperature of 20°c, what will be the volume at 50°c? a. 0.002021624 m3 b. 0.004021624 m3 c. 0.000010812 m3 d. 0.002010812 m3

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?