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They're all elliptical.

We think of an "ellipse" as an oval shape. But there are ellipses that are

so slightly oval that you couldn't tell them from circles.

Also, mathematically, a perfect circle is just a special, unusual, kind of ellipse.

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Why don't all molecules with the general atomic formula AB3 have the same shape?

because the dipoles changes from different AB3 molecule and the change of the bonding electrons pairs and the lone electrons pairs. eg. BF3 has (3BP) the shape is trigonal planar PCl3 has (3BP and 1LP) the shape is trigonal pyramidal BrF3 has (3BP and 2Lp) the shape is T-shaped


When a substance changes from one state to another is it the same shape and size?

When the state changes, it won't be the same shape because there are different properties for each of the states, e.g. liqiud can fill any shape but moves to the bottom, solid can't move and gas fills any shape. It will have the same amount of substance because it is still the same thing, just in a different state.


What is energy of electron when it is closest to the nucleus?

The energy level closest to the nucleus is the 1s orbital and can hold 2 electrons as do all s orbitals. Every electron orbital has a distinct shape and number. The 1s orbital has the same shape the 2s orbital and the 3s orbital and so forth. There are other orbital shapes such as p, d, and f. Regardless of the number or level of the orbital, all p orbitals are the same shape and all d orbitals are the same shape. Orbitals differ in distance from the nucleus and the distance is indicated by the number before the orbital shape.


Which properties do all liquids share?

All liquids have the ability to flow and take the shape of their container. They are able to exert pressure equally in all directions. Liquids also have a definite volume but no definite shape.


What is a form of matter that has a definite volume but no definite shape?

The state of matter that has definite volume, but indefinite shape is the liquid state. A solid constantly has the same shape and volume. A wooden block (solid) will not change its shape or volume unless it is melted, but that would involve changing it from solid to liquid. A liquid constantly has the same volume, but its shape changes. Find a cylindrical container that has the same volume as a rectangular container. Fill the cylindrical container with water. Then, pour the water to the rectangular container. The shape of the water changed from cylindrical to rectangular and the volume remained the same, unless some water was dropped in the process. A gas has changing shape and volume. Find a small container full of a colored gas. Open in it inside a room. The gas will spread all over the room. Its volume changed from the volume of the container to the size of the room. Its shape has changed from the shape of the container to the shape of the room.