final exam chem

What is the maximum number of electrons that can occupy the d sublevel?

10

The atomic number of an element is 29. What is the electron configuration of this element?

1s2,2s2,2p6,3s2,3p6,4s1,3d10

Sodium has an atomic number of 11. What is the electron configuration for an atom of sodium?

1s22s22p63s1

From the given electron configurations, predict which one is for a representative element?

1s22s22p63s23p64s2

Which of these represents the correct electron configuration of rubidium? [Atomic number of rubidium is 37.]

1s22s22p63s23p64s23d104p65s1

Electrons with the smallest amount of energy would occupy the principal quantum energy level of

3

Calcium (atomic number 20) has electron configuration 1s2,2s2,2p6,3s2,3p6,4s2. The atomic number of scandium is 21. Which orbital does the 21st electron enter?

3d

Transition metals in the fourth period fill the __________ orbital.

3d

Which orbital would contain electrons with the greatest amount of energy?

3d

Pick the statement about the Bohr model of the hydrogen atom that is NOT true.

An electron in a stationary state does not emit radiation.

How did Bohr answer the objection that an electron traveling in a circular orbit would radiate energy and fall into the nucleus?

Bohr described the electrons as having a fixed amount of energy.

Which two locations are MOST probable for locating the cloud of electrons?

C and D

Determine which statement is true

Currently, scientists know the energies of electrons but only approximate areas (orbitals) where the electrons are probably located.

Which statement refers to the quantum mechanical model?

Electrons are in "orbitals", regions of space where there is high probability of being found.

The Bohr model of the atom suggest that the protons and neutrons are found in the nucleus and the electrons orbit the nucleus much like planets around the sun. How is our modern model of the atom different from this model?

The electrons move around the nucleus in an electron cloud.

Compare and contrast the three subatomic particles within a neutral atom was a test question to which Jessie provided the following answer:"The atom contains protons, neutrons, and electrons. The protons and neutrons are both located in the nucleus and have the same mass. The electrons are located in the electron cloud and have very little to no mass. The proton and electron both have a positive charge and the neutron has a neutral charge."What was marked wrong in Jessie's answer?

The proton and electron have a positive charge.

What do the Bohr and quantum mechanical models have in common?

They describe electrons as having fixed energies in certain levels.

Probabilities are used in the quantum mechanical model of the atom because of Heisenberg's Uncertainty Principle. This principle states that the _________ and ________ of an electron can be measured, but not simultaneously.

charge, position

In the Bohr model of the atom, the electrons move in fixed, ________ paths around a dense, positively-charged nucleus. On the other hand, the quantum mechanical model shows the probability of finding an electron as a ___________ of negative charge.

circular; cloud

Which part of the atom cannot have its location accurately determined and is modeled by a cloud around the center of the atom?

electron

What is the identity of the element which has the following electron configuration? 1s22s22p63s23p64s23d5

manganese

An element may have several isotopes that contain different numbers of _________ but the same number of _________.

neutrons, protons

In the quantum mechanical model, each allowed ______________ has a precisely known energy, but the location of the electron cannot be determined exactly; rather, the probability of it being at a particular point in space is given by the probability density.

orbital

Although the Bohr model and the quantum mechanical model differ in how electrons are located in an atom, they both agree that each electron's energy is fixed. Another term for this is ________.

quantized

Within each energy level there are different sublevels that are created. Those electrons that have the lowest amount of energy follow paths that are spherical in shape. Which sublevel is associated with this shape?

s

Compare the valence electron configuration of the Noble gas elements seen here. What statement is correct?

s2p6.

Neils Bohr published his model of the atomic structure in 1913. He introduced the theory of electrons traveling in orbits around the atom's nucleus, with electrons orbiting only in certain orbits called shells. Each shell can contain a fixed number of electrons.

the number of electrons in the outer shells

1s22s22p63s23p64s23d1 The electron configuration represents an element in what category?

transition metals

The mass of the electron is

very small compared to the proton.