Which of these pairs of elements is most likely to be part of a polyatomic ion?

Cr and O

K and F

Li and Br

Mg and O

Which element below is least reactive? helium oxygen fluorine nitrogen

Solid calcium carbonate (CaCO3) reacts with hydrochloric acid (HCI) to form carbon dioxide, water, and calcium chloride (CaCl), according to this equation: CaCO3 (s) + 2HCl (aq) - CaCl2 (aq) + H2O (aq) + CO2 (g) Which of these actions would increase

The amount of energy required to move an electron from one energy level to the next higher one is known as: A. quantum of energy B. Aufbau principle C. mass number D. atomic number

Would beryllium or sodium have properties more similar to magnesium?

The law of conversion of mass states that what?

Why isn't air travel based on hydrogen popular today? A. Hydrogen is very expensive B. Hydrogen is difficult to find C. Hydrogen is flammable and dangerous D. Hydrogen is too cold for travelers to stand on long trips

How to get 1m solution to 0.001m solution?

If something is in high resolution you can see and object but not very clearly. True or False.

Which change might cause a cold spell in the northern united states

Kipps appratus is for what?