An ideal blackbody is an object that

1- absorbs all the energy that strikes it.

2- absorbs most of the energy that strikes it.

3- only absorbs energy at ultraviolet (black light) wavelengths.

4- absorbs a little of the energy that strikes it.

5- absorbs exactly half of the energy that strikes it.

The correct answer is option 1.

Explanation:

An ideal black body is defined as a physical body that absorbs all the radiant energies of falling on it and no energy is reflected back.

All the radiations coming in electromagnetic waves series are absorbed by the ideal black body due to which its surface appears black.

This concept of absorbing of energy is used to study radiation phenomena.

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell