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Periodic Table & Periodic Trends

When given a sulfur and iron mixture..

How do I purify sulfur and iron?

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how to get to the emperical formula?

How do you get from grams to the emperical formula?

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What is the charge on a lithium atom with 2 electrons?

What is the charge on a lithium atom that has 2 electrons? I believed the answer was a 1+ charge, but I got the question wrong on my exam. What I'm understanding is that when an atom loses an electron, as Lithium has, it creates a 1+ charge. What am I getting wrong here that the answer was incorrect?

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I need an answer to the problem stated below

what is the mass in grams of 6.022 x 10 to the 23RD power  of carbon 12?

Is the answer 12 g or 12.01 g?

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Noble Gas Configuration for Noble Gases

Can the Noble Gas Configuration of a noble gas be just the element itself? For example, Kr noble gas configuration = [ Kr ]. Is that acceptable?

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Ionization Energy

The ionization energy of vanadium from the ground state is 650.2 kJ/mol. Assume that the transition of 376 kJ/mol was from the ground state to an excited state. If that is the case, calculate the ionization energy from the excited state. 

The answer in my textbook is 274 kJ/mol, I just don't know how to get that answer, so any help would be greatly appreciated. 

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Magnesium + steam , is reaction reversible?

Q : What won't be observed when magnesium reacts with steam?

Choices : - Hydrogen will be produced

- Magnesium hydroxide formed

-Magnesium Oxide formed

- Reaction can't be reversed

 

I know Mg + H2O --> MgO + H2. This means first and third choices are out. Now, the problem is, how do I know if the last choice is true? Is the reaction is reversible?

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Calculate Atomic Mass of The Elements Assuming the Isotopic Composition is Given

Basically, I need help with Group V, this isn't HW or anything I just wanted extra practice for next year but I don't even understand what the question is asking me, I know what an isotope is, what atomic mass is, I understand the A, Z thing (A = mass #, Z = atomic #/protons) and I know the formula for atomic mass. Yet 45 minutes later watching YouTube videos and doing example problems, I still don't know how to solve that one. Help would be much appreciated. Am I looking to find the atomic mass of Group V or the atomic mass of Group VI or what exactly?

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Fill in the gaps in the following tables

I have absolutely no idea how to even start answering this question. I need help calculating the protons, neutrons and electrons. I am very lost :( 

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I need help with this chemistry question?

Atoms of the element beryllium would most likely behave similar to the way _______ behaves.

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