PS Ch. 4 Elements and the Periodic Table

The reason radioactive isotopes can be followed through the steps of a chemical reaction or process is that they

In general, which of the following statements about metals is true?

Most chemically reactive metals are in Group 1

Fluorine, chlorine, bromine, and iodine are part of a family called

Elements that are not found naturally are

In radiation therapy,

What information in the periodic table indicates the number of protons in an atom?

Why would it be difficult to determine the chemical and physical properties of a newly discovered synthetic element

Describing a metal as malleable means that it can be pounded into a new shape

The elements that do not ordinarily form compounds are

Most metals are NOT...

Which property of bromine could you NOT predict based on the fact that it is a nonmetal in the halogen family?

How did chemist change the periodic table in the early 1900's

The sun is made up of mostly...

What prediction did Mendeleev make that came true less that 20 years later?

A radioactive isotope that can be followed through the steps of a chemical reaction is an indicator.

Protons have no charge; they are neutral

To make most synthetic elements, scientist use powerful machines called

Mendeleev created the first periodic table by arranging elements in order of...

Which of the following scientists inferred that an atom's positive charge must be clustered in the nucleus?

Elements in the same column of the periodic table

IN the periodic table the most reactive metals are found...

In 1896, Henri Becquerel discoverd...

The modern periodic table is organized according to atomic mass

a column of elements is called a group or

What natrual event provides enough energy for the nuclear fusion reactions that create the heaviest elements?

Which particles in atoms have a negative electric charge

A substance that will only conduct under certain conditions

A materials is said to be ductile if it...

The two most common alkaline earth metals are

Which group of elements shares characteristics with both metals and nonmetals

In an uncharged atom, the number of protons equal the number of...

During radioactive decay atomic nuclei of unstable isotopes