The formula is H 2 O so the dot and cross diagram includes two H atoms and one O atom. H has 1 outer electron. O has 6 outer electrons. The H circles must each overlap the O circle. Nitrogen ...

For example a cube has 6 faces. Edges - An edge is where two faces ... Triangles, pentagons, hexagons, any shape. And a circle becomes a sphere with just one large, curved face, like a ball.