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The modern periodic table organizes elements according to this.
What is increasing atomic number?
The electrons in the outer energy level are called this.
What are valence electrons?
The rows on a periodic table are known as this.
What are periods?
All of the area inside an atom surrounding the nucleus where electrons are found.
What is an electron cloud?
The horizontal rows on the periodic table.
What are periods?
The three classes of elements.
What are metals, nonmetals and metalloids?
The atomic number tells you this.
What is the number of protons (and electrons) an atom of an element should have?
Particles that are smaller than an atom
What is subatomic particles?
Atoms with the same number of protons but with different neutrons
What is an isotope?
Reason Noble gases are stable.
What is a full outer energy level?
Being shiny, malleable, and conductors are properties of this class of elements.
What are metals?
Electrons that can most easily be lost, gained, and shared.
What are valence electrons?
A positively charged subatomic particle
What is a proton?
An element has 8 protons and 7 electrons. What type of ion is it?
What is positive?
Elements in the same group share these characteristics.
What are chemical and physical properties, number of valence electrons?
Group 18 elements are extremely nonreactive nonmetals known as this.
What are noble gases?
A subatomic particle without charge that contributes to the mass of the atom.
What is a neutron?
A symbol which represents each element on the periodic table
What is Chemical Symbol?
The vertical columns on the periodic table.
What are groups or families?
Group/family numbers can be an indication of this.
What is number of valence electrons?
The architect of the periodic table
Who is Dmitri Mendeleev?
Pure substances that cannot be broken down into simpler substances by chemical or physical means.
What is an element?
Number of periods on the periodic table.
What is 7?