Chocolate
Vanilla
Strawberry
Lime
Blueberry
100
Which observation or conclusion helped scientists develop the first periodic table?
Groups of elements have similar physical and chemical properties.
100
What property did Mendeleev use to develop and organize his periodic table?
Atomic Mass
100
How are elements arranged in the modern periodic table?
Atomic Number
100
What are the three broad classes of elements?
Metals, nonmetals, and metalloids
100
Which elements are examples of nonmetals?
Silicon, Boron, Germanium, Arsenic, Antimony, Tellurium.
200
Which elements have properties most similar to one another?
Elements that are found in groups.
200
Which two elements have properties most similar to those of the element sodium?
Lithium or Potassium.
200
What is a metal?
a tough substance that is a great conductor of electricity, malleable, ductile, and lustrous.
200
What is a nonmetal?
a brittle substance that are poor conductors, not shiny, and cannot be made into wires or sheets.
200
What is a metalloid?
Elements that can have properties of nonmetals and metals.
300
In general, how does atomic radius change within groups and across periods?
They increase from top to bottom, and increase from right to left.
300
What is Atomic Radius?
Half the distance between like atoms.
300
What is an Ion?
Negatively or Positively charged atoms.
300
What is a cation?
Positively charged atom.
300
What is an anion?
Negatively charged atom.
400
What is Electronegativity?
The ability to attract electrons from other atoms.
400
From top to bottom within a group of the periodic table, atomic radius tends to
Increase
400
From left to right across a period of the periodic table, atomic radius tends to
Decrease
400
The noble gases include helium, neon, argon, and xenon. What do their electron configurations have in common?
They are filled.
400
How did J.W Dobreiner classify his triads?
He noticed that the mass of one element was close to the average mass of the other two.
500
What is the name of the Group 1 Elements?
Alkali Metals
500
What is the name of the Group 2 Elements?
Alkali Earth Metals
500
What is the definition of ionization energy?
The amount of energy it takes for an element to become an ion. In other words, how much energy it takes for an element to gain or lose an electron.
500
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You just lost 500 points.
500
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You just received 500 points!