Chemistry 5.1-5.2

The atomic number of arsenic is 33. What is the electron configuration of an arsenic atom?

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p³

Use the aufbau diagram to arrange the following sublevels in order of decreasing energy: 2p, 4s, 3s, 3d, and 3p.

3d, 4s, 3p, 3s, 2p

What was the basic proposal in the Bohr model of the atom?

An electron is found only in specific circular paths or orbits around the nucleus.

Why does one electron in a potassium atom go into the fourth energy level instead of squeezing into the third energy level along with the eight already there?

Because the third shell is full

How do two sublevels of the same principal energy level differ from each other?

Each energy sublevel corresponds to an orbital of a different shape, which describes where the electron is likely to be found

How can electrons in an atom move from one energy level to another?

It changes when it obsorbs or emits light

Why do the actual electron configurations for some elements differ from those assigned using the aufbau principle?

Some actual electron configurations differ from those assigned using the aufbau principle because half-filled sublevels are not as stable as filled sublevels, but they are more stable than other configurations.

The energies of electrons are said to be quantized. Explain what this means.

The amount of energy an electron took to move from one energy level to another.

What does the quantum mechanical model determine about electrons in atoms?

The quantum mechanical model determines the allowed energies an electron can have and how likely it is to find the electron in various locations around the nucleus of an atom.

How many orbitals are in the following sublevels? a. 3p sublevel b. 2s sublevel c. 4p sublevel d. 3d sublevel e. 4f sublevel

a. there are 3 orbitals in 3p b. there is 1 orbital in 2s c. there are 3 orbitals in 4p d. there are 5 orbitals in 3d e. there are 7 orbitals in 4f when n = 1, it means it has one shell. the first shell is s, and s shells have one orbital when n=2 (2 shells), there are s and p shells, so s shells still have one orbital, but p shells have 3 orbitals. as u can see when n=3, d shells show up, it will have 5 orbitals and when n=4, f shells show up, and it will have 7 orbitals.