Which option correctly orders the elements by increasing reactivity? Hint: Review your periodic table.

Na < Li < K
Na < Li < K, ,

K < Na < Li
K < Na < Li, ,

Li < Na < K
Li < Na < K, ,

Na < K < Li

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?

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.