What does the plus mean next to an element

Why the liquid with median density floats where it does.?

Write the Lewis structure for BF4 - How many single bonds are there?

How many atoms are in 5.548 g of thorium

Which compound is the strongest acid? H2S HBr Li2O LiBr

What role does the wire play in voltaic cell? a) It allows electrons to flow from the anode to the cathode. b) It allows migration of ions from one half-cell to the other. c) It connects to the salt bridge. d) It creates the reduction reaction.

If a sample of gas occupies 400 ml at a pressure of 800 mm Hg, what will be it's volume if the pressure is reduced to 700 mm Hg

Why are water storage tanks usually built on towers or hilltops?

What is convection cell

One example of a decomposition reaction is the electrolysis of water. the chemical reaction can be expressed by the equation 2 h2o →2 h2 o2. the reactant (s) of this chemical reaction is/are?

When the positive ion of one compound replaces the positive ion of another compound?