Help! help! plz 1)What is most important of periodicity lest 4
2)why are energies of
various energy levels in hydrogen atomic are negative?​

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

How many moles of sulfuric acid (h2so4) are needed to react completely with 6.8 moles of lithium hydroxide (lioh)? 2lioh + h2so4 → li2so4 + 2h2o a. 3.4 mol h2so4b. 6.8 mol h2so4 c. 10.2 mol h2so4 d. 13.6 mol h2so4

All of the following are homogeneous mixtures except a) sugar dissolved in water. b) orange juice. c) coffee with cream. d) household vinegar. e) apple juice