In the modern periodic table, elements are arranged in order of increasing what?
What is atomic number.
100
True or False: The periodic table was first invented by Albert Einstein.
What is False.
100
How many noble gases are there in Group 8A?
What is 4 Noble Gases.
100
What is an ion?
What is An atom or group of atoms that has a positive or negative charge.
100
Chlorine is represented as what two letters on the periodic table?
What is Cl.
200
Chemists used the properties of what and sorted them into groups?
What is elements.
200
The elements in Group 8A are ...
What is Noble Gases.
200
What letter(s) represent Hydrogen on the Periodic Table?
What is H.
200
An ion with a positive charged is called a ...
What is cation.
200
Cations are always smaller than the what from which they form.
What is atoms.
300
One of the three classes of elements is...
What is metals, nonmetals, or metalloids.
300
True of False: Some elements can be sorted into transition metals.
What is True.
300
Name two things the Periodic Table states of two elements?
What is atomic number, electrons in each energy level, element symbol, element name, or average atomic mass.
300
An ion with a negative charge is a ...
What is a anion.
300
The increase in the number of occupied what shields electrons in the highest occupied energy level; from the attraction of protons and in the nucleus.
What is orbitals.
400
True of False: In general, nonmetals are good conductors of heat and electric current.
What is False; Nonmetals are poor conductors.
400
Group 1A elements are called ...
What is alkali metals.
400
Groups 1A through 7A are often referred to as...
What is representative elements
400
First ionization tends to decrease from top to bottom within a group and increase from...
What is left to right across a period.
400
One half of the distance between the nuclei of two atoms is called...
What is atomic radius.
500
The periodic law states that when elements are arranged in order of increasing atomic number there is a what of their physical and chemical properties?
What is periodic reception.
500
The nonmetals of group 7A are called...
What is halogens.
500
Name three things elements can be sorted into based o their electron configurations.
What is noble gases, representative elements, transition metals, or inner transition metals.
500
The energy required to remove an electron from an atom is called...
What is ionization energy.
500
In general, electronegative values decrease from...