Exam 12: Atoms and the Periodic Table

Suppose that a certain atom possesses only four distinct energy levels. Assuming that all transitions between levels are possible, how many spectral lines will this atom exhibit?

If an atom has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass? What is the name of this element?

The nucleus of an electrically neutral iron atom contains 26 protons. How many electrons does this iron atom have?

Which element has the atomic number 12?

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

Which of the following physical properties would you expect for krypton (Kr)?

Which of these does not describe a metal at room temperature?

Would you use a physical model or a conceptual model to describe the following: a gold coin, dollar bill, car engine, air pollution, virus, spread of sexually transmitted disease?

Which of the following statements does not describe a proton?

What happens to the properties of elements across any period of the periodic table?

Oxygen, O, (number 8), sulfur, S, (number 16), and selenium, Se, (number 34)have such similar chemical properties because

Helium, He, is a nonmetallic gas and the second element in the periodic table. Rather than being placed adjacent to hydrogen, H, however, helium is placed on the far right of the table because

If a neutral element has 8 neutrons and 7 electrons, which expression correctly identifies the element?

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

What is the relationship between the light emitted by an atom and the energies of the electrons in the atom?

Which of the following could be represented by a physical 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 following elements is in the fourth period?

Which of the following images could describe an element at the atomic level?

What do the electron configurations for all the group 18 noble gases have in common?