The atomic number of this element is 9 and its mass is 20. how many neutrons does this element have?

What process removes carbon dioxide from the ocean? A evaporation of water from the oceans B decay of dead marine organisms C precipitation into the oceans D formation of shells of marine organisms

Looking at the Bohr models of atoms offer an explanation as to WHY the atomic size changes as it does for both periods and groups. Periods: Groups:

Draw the major organic product from reaction of 2-butyne with li in nh3.

For the process 2SO2 (g) + O2 (g) 2SO3 (g), S = - 187.9 J/K and H = - 198.4 kJ at 297.0 K are known. What is the entropy of this reaction? Use G = H - TS. A) - 386.3 J/K B) - 198.4 kJ/K C) - 187.9 J/K D) - 139.3 kJ

What is the first step when measuring out acid

What's a certain indicator that a molecule is polar?

If an electron fell to a lower orbit or energy level, energy would be a. created. b. emitted. c. absorbed. d. transferred.

How many electrons are contained in an Au3 + ion? (1) 76 (3) 82 (2) 79 (4) 197

Match the element with its number of valence electrons. Column A 1. Boron : Boron 2. Carbon : Carbon 3. Fluorine : Fluorine 4. Sodium : Sodium Column B a. 4 b. 1 c. 3 d. 7

The number of energy levels to which an electron can jump depends on the