Development of the Periodic table

Question 1

Atomic mass of middle
element is equal to average of
heaviest and lightest.

Answer 1

Triads

Question 2

were groups of three elements with similar chemical properties, where the atomic mass of the middle element was roughly the average of the other two.

Answer 2

1817 Dobereiners Triads

Question 3

*First and last elements on the
octave share similar properties, limitations are elements with low atomic mass, inspired by the musical octave

Answer 3

Newlands Octave

Question 4

Who made the Newlands octave

Answer 4

John Alexander Reina Newlands

Question 5

*Arranged the elements correctly, is considered the father of the modern periodic table, discovered 63 elements

Answer 5

Dmitri Ivanovich Mendeleev

Question 6

rather than
atomic mass is the organizing
factor of the elements, modified mendeleevs law

Answer 6

Henry Moseley

Question 7

*have intermediate
properties of metals and
nonmetals

Answer 7

Metalloids

Question 7

states that when elements are
arranged in increasing atomic numbers, their
physical and chemical properties recur in a
predictable and periodic manner.

Answer 7

Periodic Law

Question 8

*very good conductors
of heat and electricity
*tend to lose valence
electrons

Answer 8

Metals

Question 9

*poor conductors of
heat and electricity
*relatively low melting
and boiling points

Answer 9

Nonmetals