How do u draw an electron dot diagram of an aluminum atom

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Which compound contain an iron with a 3+ charge