Explain why water is H2O, not HO2. Use the words valence electrons, atoms and molecules in your answer.

Here, Hydrogen is having the positive ion is placed at the first and oxygen is having negative ion is placed at the second position. Here, Hydrogen is having the positive ion is placed at the first and oxygen is having negative ion is placed at the second position. Therefore, it is written as H2O and not HO2.

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer