Question

Process by which atoms are raised from the lower level to the upper level *

Answer 1

Answer:

Hydrogen

Because hydrogen is the very first smallest atom in the modern periodic table having only one outermost shell and valency 1

Answer 2

Answer:

The process by which atoms are raised from the lower level to the upper level is called excitation.

Explanation:

• Excitation in physics is the process of adding a specific quantity of energy (excitation energy) to a system, like an atomic nucleus, an atom, or a molecule, which causes the system to change, often from its ground state of lowest energy to one of higher energy (excited state).
• The excited states of nuclear, atomic, and molecule systems are discrete in energy and not constantly distributed.
• As a result, only discrete amounts of external energy (excitation energy) can be absorbed.
• In order to promote an electron from its ground state to the first excited state in a hydrogen atom, which consists of an orbiting electron bonded to a nucleus of one proton, excitation energy of 10.2 electron volts is needed.
• The electron must be excited at a different excitation energy (12.1 electron volts) in order to move from its ground state to the second excited state.

Thus, the process by which the atoms are raised from the lower energy level to the upper energy level is called excitation.

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