Which of the following neutral elements requires the most amount of energy to form a +1 cation?

How does the electron configuration change when a neutral iron atom becomes the Fe3+ cation?

In which case does a dashed line correctly indicate a hydrogen bond between adjacent molecules?    

What is the empirical formula of a compound if a 42.7 g sample contains 44.06% iron and 55.94% saronite? Note: Saronite is a fake element that has the symbol Sa and a molar mass of 35.45 g/mol.

Using the Figure above, fill in the following statements. 6. A(n) compound forms when elements from groups 2 and 5 combine. 7. Group elements typically have a charge of +1?

Using the Figure above, fill in the following statements. 6. A(n) compound forms when elements from groups 2 and 5 combine. 7. Group elements typically have a charge of +1?

An oxide of nitrogen contains the following mass percents: 25.93% N and 74.07% O. What is its empirical formula? 

A metal object has a mass of 241.9 g and is added to a graduated cylinder initially containing 50.0 mL of water. The water level rises to 77.0 mL after adding the metal object.  What is the density of the metal?

What is the name of the compound Ti2O?

Using the Figure above, fill in the following statements. 6. A(n) compound forms when elements from groups 2 and 5 combine. 7. Group elements typically have a charge of +1?