Describe Bohr's contribution to the atomic model.

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Why do electrons enter the 4s orbital before entering the 3d orbital? O A. because the 3d orbital is at a lower energy level OB. because both the 4s and 3d orbitals are at the same energy level O c.

A spring scale is best defined as

What is the best describtion of the side of the moon that faces earth?

Knowing the chemical properties of a substance will tell you how the substance a. looks. c. can be broken down into atoms. b. smells. d. reacts with other substances.

Determine the charge on each ion in the following compounds, and name the compound. Spelling counts!

In a chemical reaction, 300 grams of reactants are combined with 100 grams of reactant b. both a and b react to completion. how much will the product weigh

If log x = - 0.761. What does x equal

Can humans can live without using natural resources.

Triangle PQR has vertices at P (-6,-4), Q (2,-10), and R (8,0). It is dilated about the origin by a scale factor of 5 to obtain triangle P′Q′R′.

Which of the following metals or nonmetals are expected to displace Mn or Cl (respectively) from MnCl2? 1. Cu should displace Mn. 2. Ca should displace Mn. 3. Br should displace Cl. 4. I should displace Cl.