What is the major difference between the two-dimensional and three- dimensional models of ethane and methane? when might you choose to use a two-dimensional model rather than a three-dimensional model when representing one of the molecules?

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

What happens to the average kinetic energy of a gas when the particles of the gas collide against each other at a constant temperature and volume? explain your answer.

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table