Exam 4: Subatomic Particles

An electron de-excites from the fourth quantum level to the third and then directly to the first. Two frequencies of light are emitted. How do their combined energies compare to the energy of the single frequency that would be emitted by de-excitation from the fourth level directly to the first level?

From which of the following atoms would removing an electron be the easiest?

How might the spectrum of an atom appear if its electrons were not restricted to particular energy levels?

What does the following element description actually mean? hydrogen-2

Which element has the atomic number 9?

The element bromine, Br (atomic number 35), has two major isotopes of similar abundance, both around 50 percent. The atomic mass of bromine is reported in the periodic table as 79.904 atomic mass units. Choose the most likely set of mass numbers for these two bromine isotopes.

Why did Rutherford propose a model for the atom with a very small nucleus containing the bulk of the mass and a positive charge?

Another interesting periodic trend is the density of the elements. We find that osmium, Os (atomic number 76) has the greatest density of all elements, and, with some exceptions, the closer an element is positioned to osmium, the greater its density. Based upon this trend, list the following elements in order of increasing density: copper, Cu, gold, Au, platinum, Pt, and silver, Ag.

If an element has 15 protons and 16 neutrons and 15 electrons, what is the atomic mass of the element?

The following statement describes which subatomic particle best? It is a nucleon.

The following statement describes which subatomic particle best? It is electrically charged.

Which of the following could NOT be represented by a conceptual model?

Light is emitted as an electron transitions from a higher energy state to a lower energy state. How long does it take for the actual transition to take place?

Which of the above has the most energy?

If you remove two protons and two electrons from a sulfur atom (S), what new element is formed?

Which loses its outermost electrons more easily: bromine, Br, or krypton, Kr?

How can a hydrogen atom, which has only one electron, have so many spectral lines?

Each atomic orbital can hold ________.

How would you describe light generated by heating pure elements if it was observed through a prism or spectroscope?

Which of the following might best explain the reason why electrons are restricted to certain energy levels in an atom?