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In the hierarchy of controls, which step should be considered first when addressing a hazard?

The graph in the previous question shows the first ionization energies for three different elements A, B, and C which are: As, Ca, and Br Which of the elements from the graph represents: Ca [calcium] As [arsenic] Br [bromine]

Below is a model of an atom of a theoretical element, X, and two possible choices for a model of the X+ ion. Which model represents the cation and why?  Because:  C. Cations are larger because they add protons D. Cations are smaller because they lose electrons from the outer shell E. Cations are larger because they add electrons  

A laser pulse with a frequency of 6.23 x 1014 Hz contains 416 kJ of energy. How many photons are in the laser pulse? 

Which of the following engineering control examples appears in the hierarchy guide?

What is the ground electron configuration of Nb2+?

Which of the following arrows points to a hydrogen bond? 

What are the hybridizations of carbon labeled 1 (C1), carbon  labeled 4 (C4) and nitrogen ?  

Describe the Lewis Structure for AsCl3 using the dropdown choices below?  The central atom is [CA] there are [SB] single bonds, [DB] double bonds, and [TB] triple bonds.  There is/are [LP] lone pair(s) surrounding arsenic.   There is/are [LP2] lone pair(s) surrounding each chlorine. 

What is the ground electron configuration of Tc2+?