C1 Development of the periodic table Flashcards
What is the periodic table?
A tabular arrangement of chemical elements organized by increasing atomic number.
Who is credited with the first widely recognized periodic table?
Dmitri Mendeleev.
True or False: The periodic table is arranged in rows called periods and columns called groups.
True.
What does the atomic number represent?
The number of protons in an atom’s nucleus.
Fill in the blank: Elements in the same group of the periodic table have similar __________.
chemical properties.
Which element is in Group 1 of the periodic table? Check
Lithium (Li).
What are noble gases?
A group of elements in Group 18 that are inert and do not readily react with other elements.
What is the significance of Mendeleev’s periodic law?
It states that the properties of elements are a periodic function of their atomic weights.
Which element has the atomic number 6?
Carbon.
True or False: Transition metals are found in the middle of the periodic table.
True.
What is the primary characteristic of alkali metals?
They are highly reactive and have one electron in their outer shell.
What are lanthanides and actinides?
Two series of elements that are placed below the main body of the periodic table.
Multiple Choice: Which of the following elements is a halogen? A) Oxygen B) Chlorine C) Argon
B) Chlorine.
What do elements in the same period have in common?
They have the same number of electron shells.
Fill in the blank: The periodic table is divided into __________ and __________ elements.
metals; nonmetals.
What is the general trend in reactivity for alkali metals as you move down the group?
Reactivity increases.
Which property generally decreases across a period from left to right?
Atomic radius.
True or False: Nonmetals are usually good conductors of electricity.
False.
What are metalloids?
Elements that have properties of both metals and nonmetals.
Which scientist arranged elements by atomic mass before Mendeleev?
John Newlands.
What major change occurred in the periodic table in the 20th century?
It was rearranged by atomic number instead of atomic mass.
What is an isotope?
Atoms of the same element that have different numbers of neutrons.
Multiple Choice: Which of the following is a characteristic of metals? A) Brittle B) Shiny C) Poor conductors
B) Shiny.
Fill in the blank: The elements in Group 17 are known as __________.
halogens.
