1.vertical columns in the periodic table indicate what information?
a. periods
b. liquids
c. synthetic elements
d. groups and families

2.which of these are families of elements?
a. metals and noble gases
b. shells and nonmetals
c. properties and rare earth elements
d. metalloids and atoms

3.why is the atomic mass of many elements not a whole number?
a. elements are unstable.
b. an element may have isotopes with different numbers of neutrons.
c. the atomic mass includes all the electrons.
d. lsotopes are always expressed in decimals.

The tone of this speech could best be described as expressing a feeling of read the excerpt from president ronald reagan's speech on the night before the 1980 presidential election, i believe we can embark on a new age of reform in this country and an era of national renewal an era that will reorder the relationship between citizen and government, that will make government again responsive to people, that will revitalize the values of family, work, and neighborhood and that will testore our private and independent social fear hope anger pride

Read the excerpt from the dark game: true spy stories from invisible ink to cia moles. yet, by the time robert e. lee surrendered to ulysses grant at appomattox, virginia, some four years later, about 620,000 soldiers had died on the battlefields, more than american battle deaths in all other wars from the revolution through the vietnam war. what is the author’s primary purpose for including this detail? to inform readers about the differences between three military conflicts to persuade readers of the seriousness of the american civil war to entertain readers with tales from behind the lines of battle to encourage readers to visit battlegrounds in appomattox, virginia

In the conclusion of the radio broadcast war of the worlds, orson welles: