Pha 200 ml dung dịch HNO3 0,1 M, H2SO4 0,1M với 300 ml dung dịch MgSO4 1M thu được dung dịch X. Tính nồng độ mol các ion trong dung dịch X.

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?