Periodic Table?

Periodic Table?



I am struck on these questions so can you people help me answering these questions about the periodic table? 


1)Which element of group 15 has the strongest metallic character? 
2)Identify the heaviest gaseous halogen at STP? 
3)Which element of period 2 is the most reactive non-metal? 
4)Identify the element that will form an ion with 5 protons, 6 neutrons, and a charge of +3? 
5)Of the four elements surrounding strontium in the periodic table, which is the most reactive? 
6)Which element should have the most similar chemical properties to K? 
7)Name an element in group 17 with a crystalline structure at STP? 
8)Which element is period 4 is a noble gas? 
9)Identify the element in period 3 most likely to have similar chemical properties to Ca? 
10)Identify the element with atomic number below 56 that is a liquid at STP? 
11)What is STP? 





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