Electrons

Bohr's model of the atom proposed that ___.

• electrons move around the nucleus in fixed orbits
• neutrons move around the nucleus
• neutrons do not exist, but are just paired protons and electrons
• the nucleus spins

The impossibility to know simultaneously the exact position and momentum of a particle is called the:

• Einstein Uncertainty Principle
• Moseley Uncertainty Principle
• Heisenburg Uncertainty Principle
• Bohr Uncertainty Principle

Which of the following correctly describes the electron cloud model?

• Electrons do not follow fixed orbits, but are found more frequently in areas around the nucleus.
• Electrons are found in fixed orbitals around a positive nucleus.
• All of an atom's mass is concentrated in the electron cloud around the nucleus.
• Electrons are evenly embedded throughout a positively charged sphere.

An atom that has gained energy beyond normal is said to be ...

• excited

• energized

• naturalized

• grounded

Valence electrons are located...

• inside the nucleus

• in outer space

• on the outermost electron shell in an atom

• on the electron shell closest to the nucleus.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many electrons can fit in the first energy level?

• 8
• 2
• 4
• 6

The energy of an electron __________ as it moves further away from the nucleus

• increases
• decreases

When an atom has all of its electrons in the lowest energy orbitals available, the atom is  

• in ground state
• in excited state
• giving off light energy
• unstable

All orbitals of equal energy are occupied by one electron before any single orbital is occupied by a second electron.

• Aufbau principle
• Pauli exclusion principle
• Hund’s rule
• Core Notation

An electron occupies the lowest energy orbital that can receive it.

• Hund’s rule
• Pauli exclusion principle
• Bohr model of the atom
• Aufbau principle