The diagram shows the electron configuration of an atom of an element for the electrons in the s and p orbitals.
What is the group number of the element in the periodic table?

1
2
13
15

Use the drop-down menus to answer each question. which runner finished the 100 m race in the least amount of time? which runner stopped running for a few seconds during the race? at what distance did anastasia overtake chloe in the race?

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

How many grams of mgbr2 are needed to produce 75g or metal?