The angle between the two bonds is called the bond angle. The name of the molecular shape is shown under Molecule Geometry in the Name box. The first row of the following table is filled in with the information for this model.
To fill out the rest of the table, in the Bonding box, click the white atom with a single bond to add a third atom to the
molecule. Use this molecular model to complete the middle row of the table.
Finally, add a fourth white atom with single bond, and use the model to complete the last row of the table.
Select the correct option from each drop-down menu to complete the table.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.