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Ck-12 Test Questions | Questions with 100% Correct Answers | Verified
What are the horizontal rows of the periodic table called? - A Period or a series. 
Which sublevel is being filled in period 1? - 1s 
Which sublevel is being filled in period 7? - 7s 5f 6d 7p 
How does the electron configuration of an element give information about the period it is in? - 
The highest occupied energy level. 
What block of elements has the d sublevels being filled? - D block 
What group are the alkali metals and hydrogen in? - Group 1 
What is the outer shell electron configuratio...