Ch 5 Section 1

Question 1

Final noble gas Radon, was discovered in 1900 by

Answer 1

Friedrich Ernst dorn

Question 2

Mendeleevs procedure left several

Answer 2

Empty spaces in his periodic table

Question 3

In 1871, the Russian chemist boldly predicted the

Answer 3

Existence and properties of the elements that would fill the spaces

Question 4

The success of mendeleevs predictions persuaded most chemists to accept his

Answer 4

Periodic table and earned him credit as the discoverer of the periodic law

Question 5

Cannizzaros method enabled chemists to agree on

Answer 5

Standard values of atomic mass and initiated a search for relationships between atomic mass and other properties of the elements

Question 6

Stanislao Cannizzaro presented a convincing method for accurately

Answer 6

Measuring the relative masses of atoms

Question 7

Periodic law means that when the elements are arranged in order of increasing atomic number elements with

Answer 7

Similar properties appear at regular intervals

Question 8

By 1860 more than… Elements had been..

Answer 8

60 discovered

Question 9

Chemists had to learn the

Answer 9

Properties of these elements as well as those of the many compounds they formed

Question 10

There was no method for accurately determine an elements

Answer 10

Atomic mass or the number of atoms of an element in a particular chemical compound

Question 11

Different chemists used different atomic masses for the same elements resulting in

Answer 11

Different compositions being proposed for the same compounds

Question 12

Cannizzaros method enabled chemists to agree on

Answer 12

Standard values of atomic mass and initiated a search for relationships between atomic mass and other properties of the elements

Question 13

Mendeleev hoped to organize the elements according to their

Answer 13

Properties

Question 14

Mendeleev noticed that when the elements were arranged in order of increasing atomic mass certain similarities in theirs

Answer 14

Chemical properties appeared at regular intervals. Such a repeating pattern is referrrrd to as periodic

Question 15

Mendeleev created a table in which elements with similar properties were

Answer 15

Grouped together– a periodic table of the elements

Question 16

Mendeleev placed iodine after tellurium although this contradicted the pattern of listing the elements in order of increasing atomic mass, if allowed Mendeleev to place tellurium in a group of elements with which it shares

Answer 16

Similar properties

Question 17

Mendeleevs procedure left several

Answer 17

Empty spaces in his periodic table

Question 18

Henry Moseley examined the

Answer 18

Spectra of 38 different metals

Question 19

Moseley discovered a previously

Answer 19

Unrecognized pattern

Question 20

Moseley found that the elements in the periodic table fit into patterns better when they were sat ranged in

Answer 20

Increasing order according to nuclear charge or the number of protons in the nucleus

Question 21

Moseleys work led to both the modern definition of atomic number and the recognition that

Answer 21

Atomic number, not atomic mass, is the basis for the organization of the periodic table

Question 22

Modeled discovery was consistent with mendeleevs ordering of the periodic table by

Answer 22

Properties rather than strictly by atomic mass

Question 23

Today mendeleevs principle of chemical periodic is correctly stated in what is known as

Answer 23

The periodic law

Question 24

Periodic law;: the physical and chemical properties of the elements are

Answer 24

Periodic functions of their atomic numbers

Question 25

Periodic law means that when the elements are arranged in order of increasing atomic number elements with

Answer 25

Similar properties appear at regular intervals

Question 26

The periodic table is an arrangement of the elements in order of their

Answer 26

Atomic numbers so that elements with similar properties fall in the same column or group

Question 27

Perhaps the most significant addition to the periodic table came with the discovery of the

Answer 27

Noble gases

Question 28

Strutt snd Ramsay discovered

Answer 28

Argon in 1894

Question 29

Argon: a gas in the atmosphere that had previously

Answer 29

escaped notice because of its total all of chemical reactivity

Question 30

In 1868, helium had been discovered as a component of the

Answer 30

Sun, based on the emission spectrum of sunlight

Question 31

To fit helium and argon into the periodic table Ramsay proposed a

Answer 31

New group

Question 32

Ramsay also discovered

Answer 32

Krypton and xenon

Question 33

Final noble gas radon was discovered in 1900 by

Answer 33

Friedrich Ernst dorn

Question 34

The lanthanides are the

Answer 34

14 events with atomic numbers from 58 to 71

Question 35

Because lanthanides are so similar in chemical and physical properties the process of

Answer 35

Separation and identifying them was a tedious task

Question 36

The actinides are rev

Answer 36

14 elements with atomic numbers from 90 to 103

Question 37

Lanthanides and actinides belong to periods

Answer 37

6 and 7 respectively, between groups 3 and 4

Question 38

Lanthanides and actinides are usually set off

Answer 38

Below main portion of periodic table to save space

Question 39

Periodicity with respect to atomic number can be observed in

Answer 39

Any group of elements in the periodic table

Question 40

The differences in atomic number between the group 1 metals follow the same pattern as the

Answer 40

Differences in atomic number between the noble gases

Question 41

Starting with the first member of groups 13-17 a similar

Answer 41

Periodic pattern is repeated

Question 42

The atomic number of each successive elements

Answer 42

8,18,18, and 32 higher than the atomic number of the element above it

Question 43

The reason for periodic is explained by the arrangement of

Answer 43

The electrons around the nucleus

Question 44

The atomic number of each successive element is

Answer 44

8, 18, 18, and 32 higher than the atomic number of the element above it