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Questions and Answers
In the modern Periodic Table, the elements are arranged according to?
Atomic Number
The pair of elements with the most similar chemical properties are: Mg and S, S and Ar, Mg and Ca, or Ca and Br?
On the Periodic Table, an element classified as a semi-metal (metalloid) can be found in?
Period 4, Group 15
Which compound contains an alkali metal and a halogen?: Rb2S, CaS, RbCl, or CaCl2?
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In the Periodic Table of the Elements, all the elements within Group 16 have the same number of?
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Which two elements have the most similar chemical properties?: K and Cl, K and S, K and Ca, or K and Na?
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Which group contains elements with a total of four electrons in the outermost principal energy level?: 18, 1, 16, or 14?
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The elements of Period 2 have the same: Atomic number, number of occupied sublevels, atomic mass, or number of occupied principal energy levels?
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Which element has the largest atomic radius?: Magnesium, Calcium, Strontium, or Barium?
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As the atoms of the elements from atomic number 3 to atomic number 9 are considered in sequence from left to right on the Periodic Table, the atomic radius of each successive atom is?
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The radius of a calcium ion is smaller than the radius of a calcium atom because the calcium ion contains the same nuclear charge and?
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More than two-thirds of the elements of the Periodic Table are classified as: Nonmetals, Noble Gases, Metals, or Metalloids?
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Atoms of metallic elements tend to?
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Which element is considered malleable: Radon, Sulfur, Hydrogen, or Gold?
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The element in Period 3 with the least metallic character is: Silicon, Sodium, Phosphorus, or Aluminium?
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As the elements are considered from top to the bottom of Group 15, which sequence in properties occurs?: metalloid ---> metal ---> nonmetal, metal ---> nonmetal ---> metalloid, metal ---> metalloid ---> nonmetal, or nonmetal ---> metalloid ---> metal?
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In which group are all the elements found naturally only in compounds?: 2, 14, 11, or 18?
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Which of the following statements best describes the alkaline earth elements?: They have two valence electrons and they form ions with a 2+ charge, They have two valence electrons and they form ions with a 2- charge, They have one valence electron and they form ions with a 1- charge, They have one valence electron and they form ions with a 1+ charge?
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The electron-dot symbol X represents?
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What group of the Periodic Table is known as the halogens?
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Which group of the Periodic Table is represented by the electron-dot symbol?
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Which element exists as monatomic molecules as STP?: Argon, Hydrogen, Chlorine, or Nitrogen?
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Which element is the most reactive?
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Which element is the most reactive nonmetal?
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Which element has properties of both metals and nonmetals?
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Compare element A and element D in terms of the following physical properties: (1) malleability, (2) electrical conductivity, (3) density
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Study Notes
Periodic Table Overview
- The modern Periodic Table arranges elements by atomic number.
- Elements with the most similar chemical properties are typically in the same group; for example, Mg and Ca.
Classifications and Groups
- Semi-metals (metalloids) are located in Period 4, Group 15.
- Group 16 elements have the same number of valence electrons.
- The 14 group contains elements with four electrons in the outermost energy level.
- Elements in Group 2 are found naturally only in compounds.
Chemical Properties and Compounds
- The compound RbCl contains both an alkali metal and a halogen.
- The most reactive nonmetal is represented as D.
- Elements are compared based on characteristics; e.g., Element A is more malleable and has higher conductivity and density than Element D.
Atomic Structure and Trends
- The atomic radius decreases across a period from left to right due to increased nuclear charge.
- A calcium ion has a smaller radius than a calcium atom because of fewer electrons while maintaining the same nuclear charge.
- The element with the largest atomic radius in a given list is Barium.
Malleability and Reactivity
- Gold is considered a malleable element.
- For metals, the tendency is to lose electrons and form positive ions.
Electron-Dot Symbols
- The electron-dot symbol can indicate groups, such as Group 16 and alkaline earth metals.
- Argon exists as monatomic molecules at standard temperature and pressure (STP).
Summary of Reactivity
- The most reactive element is A compared to nonmetals represented by D.
Group Properties and Trends
- As you move from top to bottom in Group 15, the sequence of properties shifts from nonmetal to metalloid to metal.
- Alkaline earth elements possess two valence electrons and form 2+ ions.
Studying That Suits You
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Description
Test your knowledge of the Periodic Table with these flashcards that cover essential terms and definitions. Whether you're learning about atomic numbers or element classifications, these cards will help reinforce your understanding of chemistry concepts.
