Unit 3 Formative Assessment

What are the three broad classes of elements shown on the periodic table?

• Solids, liquids, gasses
• metals, nonmetals, gasses
• metals, liquids, noble gasses
• metals, nonmetals, metalloids

Which elements are examples of nonmetals?

• sodium, potassium, calcium
• silicon, germanium, astanine
• barium, iron, cobalt
• argon, sulfur, oxygen

Which two elements have properties most similar to those of the element Sodium?

• lithium, potassium
• magnesium, aluminum 
• selenium, scandium 
• krypton, zenon

How many electrons are in the highest occupied energy level of an element in Group 5A (Group 15)?

• 1
• 3
• 5
• 7

As shown by the periodic table, why do the elements potassium and sodium have similar chemical properties?

• They are in the same group and have the same number of electrons in the highest occupied energy level
• They are in the same group and an atom of either element has one electron in a p orbital.
• They are in the same period and an atom of either element has an odd number of protons in its nucleus.
• They are in the same period and a sodium atom has only one more electron than a potassium atom has.

Of the elements Pt, V, Li, and Kr, which is a nonmetal?

• Pt
• V
• Li
• Kr

The electron configuration for an element is 1s22s22p63s23p6. What is the atomic number of the element?

• 3
• 11
• 18
• 22

Iron is a transition metal with an atomic number of 26. What is the electron configuration of iron?

• 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^6
• 1s^2 2s^2 2p^6 3s^2 3p^6 3d^6 4s^2 
• 1s^2 2s^2 2p^6 3s^2 3p^6 3d^8
• 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^6

Use your understanding of the experimental design and conclusions used in the development of modern atomic theory to answer this question:  What was Bohr's basic proposal about the atom?

• An electron remains in a fixed position in the space around the nucleus.
• An electron is found in a specific circular path, or orbit, around the nucleus.
• An electron oscillates, or moves back and forth, within one small region of space in the atom.
• An electron readily exchanges position with either a proton or a neutron

Which is NOT one of the three rules for writing the electron configurations of elements?

• Aufbau Principle
• Pauli Exclusion Principle
• Law of Conservation of Energy
• Hund's Rule