Periodic Table and Periodic Trend

Question 0

Berzelius

Answer 0

• developed a table of atomic weights

- introduced letters to symbolize elements

Question 1

Cannizzaro

Answer 1

• developed and proposed a standard method for accurately measuring the relative atomic masses
• enabled chemists to agree on standard values for atomic masses
• allowed chemists to search for periodic trends among the elements

Question 2

Prout

Answer 2

-stated that hydrogen was the fundamental element from which all elements were composed

Question 3

Doberiener

Answer 3

• triads
• certain groups of three elements when placed in order of increasing atomic masses showed similar properties and the middle element had the properties midway between the other two

Question 4

Newlands

Answer 4

• Law of Octaves

- the 1st and 8th elements when placed in order of increasing atomic mass have similar properties

Question 5

Dmitri Mendeleev

Answer 5

• organized the elements according to increasung atomic mass
• noticed that similar properties appeaared periodically
• first periodic table (1869)

Question 6

Henry Mosley

Answer 6

-the elements in the periodic table fit into patterns better when they were arranged in increasing order according to nuclear charge, or the number of protons in the nucleus

Question 7

periodic law

Answer 7

the properties of the elements (chemical and physical) are a periodic (repeating) function of their atomic number