Which of the following elements will have its valence electrons represented as in Figure A? I. Oxygen and Sulfer
II. Selenium and Tellurium
III. Polonium only

A. I only
B. II only
C. III only
D. I, II, and III

Classify each statement about effective nuclear charge, zeff, as true or false.

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot? question 7 options: the heat from the hot water is conducted through the spoon handle the hot water heats the air surrounding the upper part of the spoon. the hot water causes a physical change in the spoon handle. the hot water causes a chemical reaction to take place in the spoon.

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore