Why did mendeleev leave blanks in his early version of the periodic table?

What happens to the particles during solid to a liquid

A metal ice-cube tray and a plastic tub of ice cream are sitting in the freezer. Why does the ice-cube tray feel colder to touch than the tub of ice cream? A. The metal ice cube tray has a lower latent heat of fusion. B.

Which method would be best to separate a mixture of sand and stones? magnetism filtration screening separation by density

What do I need to convert mass of product to ma's of a reactant

8.7 moles of ammonia (NH3) is formed in the following reaction. How many grams of hydrogen reacted?

Balance the following reaction. Leave the box empty if no other coefficient is needed. C2H5 + O2 → CO2 + H2O

What three human body systems coordinate cause an arm to move

Which statement does NOT apply to Alkenes? They readily react They have double bonds They are more stable than alkanes They are unsaturated

Why do scientists say that this technology will not harm fish in the area?

What is the primary cause of global wind patterns on earth?