Which is the correct Lewis structure for COF2?

Which of the following statement(s) is/are correct?    Au is the symbol for gold  Po is the symbol for potassium C is the symbol for carbon 

Which of these ions has the largest radius (Se2-, Br-, Rb+, or Sr2+ )? 

A 36.0 g sample of an unknown metal is heated from 25oC to 35oC and 171.7 J of heat is absorbed. Use the chart below to identify the unknown metal.  

Which of the following statement(s) about phase transitions is/are correct? Freezing refers to the phase transition from solid to liquid Sublimation refers to the phase transition from solid to gas. Vaporization refers to the phase transition from liquid to gas.

Use the theoretical chemical symbol below to determine is corresponding statements are true or false.    Element Z has 710 protons.  [1] Element Z has 405 neutrons.  [2] Element Z has 307 electrons.  [3]  

Which of the following compounds contains an exception to the octet rule on the central atom? SO3 [1] BF3 [2] NO2 [3]

Which of the following statement(s) is/are correct  Sample A can be a representation of a flask containing sulfur dioxide gas. Sample B can be a representation of a flask containing carbon monoxide gas. Sample C can be a representation of a flask containing helium gas and hydrogen gas. 

Which of the following statement(s) is/are correct?   Ag is the symbol for silver H is the symbol for hydrogen S is the symbol for sodium 

Choose the correct name for NiS2.