Please help me with these atom related physics questions. thank you :)?

Question

The best way to describe the basic building blocks of matter would be to categorize them as:

Particles

Waves

Both waves and particles

Neither waves nor particles

Electrons differ from photons by:

Charge

Mass

Velocity

All of these

The model of the hydrogen molecule is best understood through the use of:

Quantum mechanics

Classical mechanics

Electrostatics

Relativity

Probability density of the wave equation of an electron has the units:

m -3/2

m 3/2

m -2/3

m 2/3

Which statement is the most correct?

Quantum mechanics fits perfectly into the classical models of mechanics and electromagnetism.

Quantum mechanics overthrew mechanics and electromagnetism by replacing all of their laws with its own.

Quantum mechanics is now considered obsolete compared to classical mechanics and electromagnetism.

Quantum mechanics currently stands separate yet as equally viable as classical mechanics and electromagnetism.

Answer 1

1.  the last 2 are ok, depending how you look at it.... or non classical particles

2. all, since c is unattainable for electron... and the rest is obvious

3. QM

4. i guess at m^-2/3      for 3d right? that makes sense

5. the last one.

Answer 2

first answers is particles

second is mass as photon is the energy that is generated by moving electric charges

third is quantum mechanics

m 3/2

Quantum mechanics overthrew mechanics and electromagnetism by replacing all of their laws with its own.