Hemistry hostry Flashcards
(26 cards)
Who is known as the father of the periodic table?
Dmitri Mendeleev
What year was the periodic table first published by Mendeleev?
1869
True or False: The periodic table is arranged by increasing atomic mass.
False
Which scientist discovered the electron?
J.J. Thomson
What is the primary basis for the arrangement of elements in the modern periodic table?
Atomic number
Fill in the blank: The periodic law states that the properties of elements are a periodic function of their __________.
Atomic numbers
Who proposed the nuclear model of the atom?
Ernest Rutherford
In what year did J.J. Thomson discover the electron?
1897
What element did Mendeleev predict would be discovered and fit into his periodic table?
Gallium
Which particle was discovered by James Chadwick?
Neutron
True or False: The noble gases were the last group of elements to be added to the periodic table.
True
What does the term ‘periodicity’ refer to in the context of the periodic table?
Recurring trends in properties of elements
Who is credited with the discovery of the proton?
Ernest Rutherford
What was the first element to be artificially synthesized?
Technetium
Fill in the blank: The periodic table is divided into __________ and __________.
Metals, Nonmetals
What significant change did Glenn T. Seaborg make to the periodic table?
He moved the actinides and lanthanides below the main body.
Which group of elements is characterized by their lack of reactivity?
Noble gases
What is the significance of the atomic number in the periodic table?
It determines the element’s identity.
True or False: The periodic table contains only naturally occurring elements.
False
What does the term ‘alkali metals’ refer to?
Group 1 elements in the periodic table.
Who developed the first periodic table that included all known elements?
Dmitri Mendeleev
What is the main characteristic of transition metals?
They can form variable oxidation states.
Fill in the blank: The elements in group 17 are known as __________.
Halogens
What is the role of the neutron in the atom?
To provide stability to the nucleus.
