Chemistry Unit 4 Practice for Test

What is the maximum number of electrons that can be present in each principal energy level of hydrogen (the 1st energy level)?

• n

• n²

• 2n

• 2n²

What is the lowest energy state of an atom called?

• the ground state

• the excited state

• the solid state

• the chaotic state

The concept that all moving particles have wave characteristics is attributed to ___________.

• de Broglie

• Thomson

• Heisenberg

• Bohr

In the figure, why are there dots beyond the "boundary" of the atomic orbital?

• the boundary encloses the volume in which the electron is found 90% of the time

• the boundary is three-dimensional, while the picture shows only two dimensions

• experimental error

• the boundary encloses the volume in which the electron is found 50% of the time

Which principle states that we cannot know the location AND momentum (energy) of an electron simultaneously?

• Bohr

• Hesienberg Uncertainty Principle

• Shrodinger

• Einstein

The area of 3D space where an electron is likely to be found is called a(n)

• orbit
• ring
• nucleus
• orbital

What orbital shapes are found at the 2nd energy level

• s only
• s and p
• s, p, d and f
• p only

How many orbitals are at the "p-sublevel"?

• 1
• 3
• 5
• 7

What element/s is/are present in the unknown?

• lithium

• sodium

• helium

• hydrogen

A line emission spectrum is produced when and electron releases energy as it moves...

• from a lower energy level to a higher energy level

• from a higher energy level to a lower energy level

• within the same energy level