Atomic Physics | MCQs

Explanation

Oxygen is the chemical element with the symbol O and atomic number 8.

Oxygen Discoverers: Joseph Priestley, Antoine Lavoisier, Carl Wilhelm Scheele

Oxygen Symbol: O

Oxygen Atomic number: 8

Oxygen Electrons per shell: 2, 6

Explanation

It is a highly unstable isotope of hydrogen.

Hydrogen has no neutron.

It contain only one proton and one electron.

But the deuterium contain one neutron and tritium contain two neurons,

these are the isotopes of hydrogen.

Explanation

When an electron jumps from a higher to a lower energy level, it radiates energy in the form of light or photons.

This process is responsible for the emission spectra seen in atoms.

Explanation

Atomic mass = number of protons + number of neutrons → 2 + 1 = 3.

Electrons do not contribute significantly to atomic mass.

Explanation

The maximum number of electrons in any shell is determined by the formula 2n², where n is the principal quantum number.

This formula comes from quantum mechanics and defines the electron capacity of energy levels in an atom.

Explanation

As two atoms come closer, attractive forces (like between electrons and nuclei) try to pull them together.

Simultaneously, repulsive forces (like between electron clouds or nuclei) also increase, balancing the interaction.

Explanation

A metastable state is an excited state of an atom or molecule that has a significantly longer lifetime compared to other excited states, but is still shorter than the ground state.

This means that an electron in a metastable state can stay in that state for a relatively long time before transitioning back to a lower energy level. 

Explanation

Explanation

Explanation

Quantum numbers describe values of conserved quantities in the dynamics of a quantum system