Homework 2 Module 1: The Periodic Table

Which group contains the alkali metals?

1A

Using the periodic table, which isotope is probably the most abundant isotope of potassium (K)?

39K

Suppose element Zz contained the four isotopes listed in the choices below. Which symbol represents the majority of the element Zz found in nature if its atomic weight is 41.8?

42Zz

Lithium forms compounds which are used in dry cells and storage batteries and in high-temperature lubricants. It has two naturally occurring isotopes, 6Li (isotopic mass = 6.015121 amu) and 7Li (isotopic mass = 7.016003 amu). What is the percent abundance of lithium-6? Select one: a. 92.5% b. 86.7% c. 46.2% d. 7.5% e. 6.1%

7.5%

Which of the substances listed is not an element?

Air

Which of the following does not belong to the same period as the others?

Ar

Which of the following are halogens? Mark all that apply.

F, Cl, Br

True or False: Calcium is a transition metal as is indicated by its location in the periodic table.

False

True or False: Carbon and oxygen are diatomic elements.

False

Which of the following lists elements with the most similar chemical properties?

Mg, Ca, Sr

True or False: Ca and Mg are in the same group of the periodic table.

True

True or False: Hydrogen and nitrogen are diatomic elements.

True

Which of the following are metals? Mark all that apply.

Zr and Ba

Looking at the periodic table, what is probably the most abundant isotope of calcium (Ca)? Look up the name of the element on your periodic table if you are not sure.

calcium-40

Beryllium and magnesium can be predicted to have similar properties because they are in the same___ on the periodic table.

group

Silicon has three naturally occurring isotopes. Two of them are Si-28 and Si-29. In no particular order, one of these has an abundance of 92.2% and one is 4.7%. Which is most likely to be the isotope that is 4.7% abundant?

silicon-29

Looking at the periodic table, what is probably the most abundant isotope of Sn? Look up the name of the element on your periodic table if you are not sure.

tin-119