Lewis structure for H2O

The skeleton structure is H-O-H. O has 6 valence electrons, and each H has one. You must arrange 8 electrons in pairs so that O has 8 and each H has two electrons in its valence shell. You have eight valence electrons in your trial structure, so it has the correct number of electrons.

Explanation:

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The skeleton structure is H-O-H. O has 6 valence electrons, and each H has one. You must arrange 8 electrons in pairs so that O has 8 and each H has two electrons in its valence shell. You have eight valence electrons in your trial structure, so it has the correct number of electrons.

Explanation:

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