If calcium has two valence electrons and fluorine has seven, how many fluorine atoms are needed to form an ionic bond with calcium

What net ionic equation describes the reaction between Pb (NO3) 2 (aq) and Na2CO3 (aq) ?

How many moles of each reactant are needed to produce 6.17 miles of HF (NH3) + F = (N2F4) + HF

Covalent bonds are formed in order to:

Which of the following would have the most difficult time holding onto heat? A. aluminum B. carbon C. mercury D. zinc

A balloon filled with 1.22 l of gas at 286 k is heated until the volume is 2.86 L while the pressure remains constant. What is the temperature of gas in Kelvin. Round to nearest whole number

What force (in newtons) is required to accelerate a body with a mass of 32 kilograms at a rate of 12 m/s2? If a body with a mass of 4 kg is moved by a force of 20 N, what is the rate of its acceleration?

A. draw the structure of the tetrahedral intermediate initially-formed in the reaction shown. reactions of esters with

The water level in a graduated cylinder stands at 20.0 ml before and at 26.2 ml after a 16.74 g metal sample is lowered into the cylinder. what is the density of the sample. what metal is the sample most likely to be

What are the tube feet on a star fish

What kingdom is humans in!