Quantum Mechanics

True or False: Electrons are considered stable at their ground state.

• TRUE
• FALSE

For an electron to change from ground state to an excited state it must...

• Absorb energy
• Release energy

Tags

NGSS.HS-PS1-2

If an electron moves from n=2 to n=4 ...

• it absorbs energy
• it releases energy

How many electrons does Si contain? (click to see image)

• 14
• 28
• 2
• 4

Tags

NGSS.HS-PS1-1

An orbital can at most hold how many electrons?

• 1 electron
• 2 electrons
• 3 electrons
• 4 electrons

The weak nuclear force is responsible for - 

• pulling two masses together
• the repulsion of like charges
• the radioactive decay of certain atomic nuclei
• holding the nucleus of an atom together

Tags

NGSS.HS-PS1-8

The force that holds the nucleus of an atom together is - 

• weak and short ranged
• strong and short-ranged
• weak and long-ranged
• strong and long-ranged

He unknowingly discovered the electron as a result of cathode ray tube experiments.    

• Thomson
• Chadwick
• Democritus
• Aristotle

What shape are "p" orbitals? 

• Cloverleaf shaped
• Spherical shaped
• Hybrid structure
• Dumbell shaped

A three-dimensional region around a nucleus where an electron may be found is called a(n

• orbit
• circle
• orbital
• circuit