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Questions and Answers
Which term refers to the horizontal rows in the periodic table?
Which term refers to the horizontal rows in the periodic table?
- Elements
- Isotopes
- Periods (correct)
- Groups
What is the basic unit of matter?
What is the basic unit of matter?
- Compounds
- Molecules
- Atoms (correct)
- Electrons
Which kind of gases typically do not form compounds?
Which kind of gases typically do not form compounds?
- Hydrogen gases
- Noble gases (correct)
- Toxic gases
- Flammable gases
An atom's mass number is the sum of:
An atom's mass number is the sum of:
What varies in isotopes of the same element?
What varies in isotopes of the same element?
By what property are elements ordered in the modern periodic table?
By what property are elements ordered in the modern periodic table?
What type of elements are good conductors of electricity and heat?
What type of elements are good conductors of electricity and heat?
What are the vertical columns in the periodic table called?
What are the vertical columns in the periodic table called?
Who published the first version of the periodic table?
Who published the first version of the periodic table?
Atoms of the same element are identified by the number of:
Atoms of the same element are identified by the number of:
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Study Notes
Periodic Table Structure
- The horizontal rows in the periodic table are referred to as periods.
- The vertical columns in the periodic table are called groups.
Atomic Structure
- The basic unit of matter is an atom.
- An atom's mass number is the sum of protons and neutrons in the nucleus.
Isotopes
- Isotopes of the same element vary in the number of neutrons in the nucleus.
Periodic Table Organization
- Elements in the modern periodic table are ordered by their atomic number.
- Noble gases are a type of gas that typically do not form compounds.
Element Properties
- Metals are good conductors of electricity and heat.
History of the Periodic Table
- Dmitri Mendeleev published the first version of the periodic table.
Element Identification
- Atoms of the same element are identified by the number of protons in the nucleus.
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