Chemistry Questions 2 unit 1

The atomic model that states the idea of neutralization of the atom is

• Rutherford model

• Thomson model

• Dalton model

• Greek philosophers

The scientist who discovered the charge of the nucleus

• Rutherford

• Boyle

• Bohr

• Aristotle

What was Bohr's major contribution to atomic theory?

• The indivisibility of atoms

• The quantization of electron energy levels

• The spherical shape of atoms

• The discovery of the nucleus

What happens when an electron gains energy in an atom?

• It moves to a lower level

• It is absorbed by the nucleus

• It becomes a proton

• It moves to a higher energy level

According to modern atomic theory

• electrons revolves in energy levels

• electrons are particles with wave motion

• the electron mass is neglected

• the electrons are negatively charged

The line spectra is specific because there is not two elements have

• physical properties

• mass number

• physical state

• atomic number

Appearance of more than one spectral line indicates

• there is more than one electron

• existence of nucleus in the middle

• there is more than energy level

• rotation of electrons

The cathode rays consist of very fine particles called

• electrons.

• protons.

• α-particles.

• photons.

Region at which the electrons most probable found is called

• Energy level

• Orbital

• Nucleus

• Electron cloud

According to Rutherford theory deviation of alpha rays indicates that

• Most atom space

• Nucleus is negative

• Nucleus is positive

• It is affected by magnetic and electric fields