Which molecule has a tetrahedral arrangement of electron pairs but is not a tetrahedral molecule?

methane

water

carbon dioxide

boron trifluoride

Water

Explanation:

Electron geometry (arrangement) is tetrahdral but its molecular geometry is bent.

Oxygen has 6 electrons in the outermost shell but it only uses 2 electrons for forming bonds with 2 Hydrogen atoms. The oxygen atom - center atom is surrounded by four electron pairs (2 pairs with 2 Hydrogen atoms, 2 lone pairs) so that its shape is tetrahedral. In contrast, it's supposed to be linear shaped but in fact it has bent molecular geometry due to lone pairs repel other electron pairs more strongly than bonded electrons.

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3