Which pair of atoms can form an ionic bond?

* Na, K (Sodium, Potassium)

* K, F (Potassium, Fluorine)

* F, Cl (Fluorine, Chlorine)

* Na, Ne (Sodium, Neon)

Limestone originates because of: A. chemical precipitation B. chemical weathering C. physical weathering D. biological processes

As a substance changes phase from a gas to liquid to solid: A - The spacing between molecules increases. B - It's density generally increases. C - The spacing between molecules is not affected. D - It undergoes chemical change.

A 75.00 g sample of a substance is analyzed and found to consist of 32.73 g phosphorus and 42.27 g oxygen. calculate the percent composition of this substance.

How many electrons would sulfer need to lose or gain to achieve a noble gas configuration? What would the resulting charge of the ion?

CaCO3 (s) ⇄ CaO (s) + CO2 (g) 0.100 mol of CaCO3 and 0.100 mol CaO are placed in an 10.0 L evacuated container and heated to 385 K. When equilibrium is reached the pressure of CO2 is 0.220 atm. 0.

A rock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. How long ago was the rock formed? A. 1.25 billion years ago B. 2.5 billion years ago C. 3.75 billion years ago D.

Calcium is an element. What is the smallest particle of calcium that has all the chemical properties of calcium?

Which is the best term to use when describing the energy of motion

The pka of hypochlorous acid is 7.530. a 54.0 ml solution of 0.114 m sodium hypochlorite (naocl) is titrated with 0.337 m hcl. calculate the ph of the solution

An atom has no overall charg if it contains equal number of