Atoms Test - 20...

The ionisation potential of hydrogen atom is -13.6 eV. An electron in the ground state of a hydrogen atoms absorb a photon of energy 12.75 eV. How many different spectral line can one expect when the electron make a downward transition?

What is the mass of neutron?

What is the electronic configuration of phosphorus?

A substance consisting of atoms which all have the same number of protons is called a/an

$$U^{235}, U^{238}, U^{239}$$ are the atoms of the uranium. Which are called as

Which instrument was used for the discovery of the electron?

When a high energy (fast moving) electron approaches a heavy metal target, some of the electrons are significantly deflected by nuclei, and they lose much of their energy. This lost energy goes into the creation of high energy photons.
What process is being described here?

A high energy photon collides elastically with a charged particle (usually an electron)., The photon "bounces away" with less energy (a longer wavelength).
The process described here is known as :

What is the correct order in which the listed atomic models were advanced and accepted, earliest first?

Which of the following can produced emission spectrum ?