Questions and Answers
Approximately how many elements are metals?
3/4 of the periodic table
When Mendeleev developed the first periodic table, there were approximately ____ known elements.
60
What is meant by periodic in Periodic Table?
The table has repeated cycles
The place of an element in the modern periodic table is determined by its _____
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A single horizontal portion of the periodic table is called ____.
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Which elements have properties of both metals and nonmetals?
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All of the following elements conduct electricity (lead, carbon, iron, vanadium), which is not a metal?
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Which of the following elements is the most common element in the universe?
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Which elements are located between the metals and the nonmetals on the periodic table?
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The modern periodic table is arranged in order of increasing __________.
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This is the break point to switch tests.
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How many carbon atoms would fit into the period at the end of a sentence?
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The nucleus of an atom consists of?
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A single proton has which electrical charge?
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Which two particles would be attracted to each other?
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A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is ____.
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If two atoms have the same number of protons but different numbers of neutrons, they will have the same ____.
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Which particles have almost the same mass?
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The particles that make up an atom are _____
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In an atom, electrons ____.
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The energy levels of an atom are occupied by?
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Which of the following statements about the atom is false? (each atom has a tiny nucleus at its center, all the protons and neutrons are located in the nucleus, electrons travel in circular pathways around the nucleus, all atomic nuclei are positive)
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Changing the number of protons in the nucleus of an atom changes it into an?
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Reducing the number of electrons in a neutral atom's electron cloud will create a?
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Increasing the number of neutrons in the nucleus of an atom of an element will create a?
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Study Notes
Elements in the Periodic Table
- Approximately 3/4 of the periodic table consists of metals.
- When Mendeleev created the first periodic table, about 60 elements were known.
Characteristics of the Periodic Table
- The term "periodic" refers to the repeating cycles of element properties.
- The position of an element in the modern periodic table is determined by its atomic number.
- A horizontal row in the periodic table is called a "period."
Types of Elements
- Metalloids possess characteristics of both metals and nonmetals.
- Carbon is an element that conducts electricity but is not classified as a metal.
- Hydrogen is the most common element in the universe.
Structure of Atoms
- The nucleus of an atom is made up of protons and neutrons.
- A single proton has a positive electrical charge.
- Electrons and protons are attracted to each other due to their charges.
Atomic Composition
- An atom with 26 protons, 26 electrons, and 30 neutrons has a mass number of 56.
- Atoms that have the same number of protons but different numbers of neutrons have the same atomic number.
- Protons and neutrons have almost the same mass.
Electron Configuration
- Atoms consist of protons, neutrons, and electrons.
- Electrons travel outside the nucleus of an atom, occupying various energy levels.
- The statement "Electrons travel in circular pathways around the nucleus" is false; their paths are not strictly circular.
Changes in Atomic Structure
- Altering the number of protons in an atom changes it into a different element.
- Reducing the number of electrons in a neutral atom creates a positive ion of that element.
- Increasing the number of neutrons in the nucleus creates a more massive isotope of the element.
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Description
Test your knowledge on the periodic table and the properties of matter with these flashcards. Learn about the categorization of elements, their characteristics, and notable historical facts related to Mendeleev's work. Perfect for students studying chemistry or anyone interested in understanding elemental properties.
