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Questions and Answers
Questions and Answers
Group 7A of the periodic table contains the most reactive:
Group 7A of the periodic table contains the most reactive:
- Nonmetals (correct)
- Alkaline Earth Metals
- Noble Gases
- Metals
One twelfth the mass of a carbon-12 atom is used to define:
One twelfth the mass of a carbon-12 atom is used to define:
atomic mass unit
The unit for atomic mass is:
The unit for atomic mass is:
amu
The usefulness of Mendeleev's periodic table was confirmed by:
The usefulness of Mendeleev's periodic table was confirmed by:
In a periodic table, a set of properties repeats from:
In a periodic table, a set of properties repeats from:
As you move from left to right across a periodic table, the number of valence electrons:
As you move from left to right across a periodic table, the number of valence electrons:
Compared with Group 2A elements, Group 6A elements have:
Compared with Group 2A elements, Group 6A elements have:
The tendency of an element to react is closely related to what?
The tendency of an element to react is closely related to what?
List the Group 1A elements from the most reactive to the least reactive.
List the Group 1A elements from the most reactive to the least reactive.
List the Group 7A elements from the most reactive to the least reactive.
List the Group 7A elements from the most reactive to the least reactive.
Which element is found in most of the compounds in your body except for water?
Which element is found in most of the compounds in your body except for water?
Mendeleev's organized elements in his periodic table in order of increasing:
Mendeleev's organized elements in his periodic table in order of increasing:
Mendeleev's periodic table was useful because it enabled scientists to predict properties of unknown:
Mendeleev's periodic table was useful because it enabled scientists to predict properties of unknown:
Boron is one block to the left of carbon in the periodic table. The atomic number of carbon is 6. The atomic number of boron is:
Boron is one block to the left of carbon in the periodic table. The atomic number of carbon is 6. The atomic number of boron is:
The atomic mass unit (amu) is defined as one twelfth the mass of a:
The atomic mass unit (amu) is defined as one twelfth the mass of a:
Elements can be classified as metals, nonmetals, and:
Elements can be classified as metals, nonmetals, and:
From left to right across a period in the periodic table, element 4, beryllium, has two valence electrons. Element 5, boron, has:
From left to right across a period in the periodic table, element 4, beryllium, has two valence electrons. Element 5, boron, has:
Element 3, lithium, has one valence electron, and element 4, beryllium, has two valence electrons. Element 5, boron has:
Element 3, lithium, has one valence electron, and element 4, beryllium, has two valence electrons. Element 5, boron has:
In general, an alkali metal will be more reactive than an alkaline earth metal in the same period.
In general, an alkali metal will be more reactive than an alkaline earth metal in the same period.
Although they are called neon light, they can contain any noble gas.
Although they are called neon light, they can contain any noble gas.
Reactive elements, such as alkali metals and halogens, are found in nature only as:
Reactive elements, such as alkali metals and halogens, are found in nature only as:
Suppose you are looking at elements in the periodic table in this order: element 23, element 24, element 25, element 26, and so on. Are you looking across a period or down a group?
Suppose you are looking at elements in the periodic table in this order: element 23, element 24, element 25, element 26, and so on. Are you looking across a period or down a group?
What determines an element's chemical properties?
What determines an element's chemical properties?
In the periodic table, there are two numbers in the block for the element potassium (K): 19 and 39.098. What do these two numbers represent?
In the periodic table, there are two numbers in the block for the element potassium (K): 19 and 39.098. What do these two numbers represent?
Boron (B), silicon (Si), germanium (Ge), and arsenic (As) have properties that fall between those of metals and nonmetals. What common label could you apply to these elements?
Boron (B), silicon (Si), germanium (Ge), and arsenic (As) have properties that fall between those of metals and nonmetals. What common label could you apply to these elements?
Period 5 of the periodic table begins with element 37 and ends with element 54. Which of the following elements is most likely to be a transition metal?
Period 5 of the periodic table begins with element 37 and ends with element 54. Which of the following elements is most likely to be a transition metal?
Element X has one valence electron, element Y has one valence electron, and element Z has five valence electrons. Which two of these elements are most likely to have similar properties? Explain your answer.
Element X has one valence electron, element Y has one valence electron, and element Z has five valence electrons. Which two of these elements are most likely to have similar properties? Explain your answer.
Among the alkaline earth metals in Group 2A, which is more reactive - beryllium (element A) or strontium (element 38)?
Among the alkaline earth metals in Group 2A, which is more reactive - beryllium (element A) or strontium (element 38)?
Sodium chloride is a compound of sodium and chlorine. Which of these elements is the alkali metal, and which is the halogen?
Sodium chloride is a compound of sodium and chlorine. Which of these elements is the alkali metal, and which is the halogen?
Questions and Answers
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Study Notes
Study Notes
Key Characteristics of Groups in the Periodic Table
- Group 7A consists of the most reactive nonmetals.
- Group 1A elements arranged from most to least reactive: Francium, Cesium, Rubidium, Potassium, Sodium, Lithium.
- Group 7A elements ordered by reactivity: Fluorine, Chlorine, Bromine, Iodine, Astatine.
- Group 6A elements have more valence electrons than Group 2A elements.
Atomic Mass and Definitions
- Atomic mass unit (amu) is defined as one-twelfth the mass of a carbon-12 atom.
- The unit of atomic mass is amu.
- The atomic number represents the number of protons in an element's nucleus.
Mendeleev and the Periodic Table
- Mendeleev organized elements in the periodic table by increasing mass.
- His periodic table was confirmed useful through the discovery of elements with predictive properties.
- Enabled predictions of unknown element properties.
Properties of Elements
- As you move left to right in the periodic table, the number of valence electrons increases.
- The tendency of an element to react is closely related to its number of valence electrons.
- Elements are classified as metals, nonmetals, and metalloids, with boron, silicon, germanium, and arsenic recognized as metalloids.
Reactivity in Elements
- Alkali metals are generally more reactive than alkaline earth metals within the same period.
- Reactive elements, such as alkali metals and halogens, exist only in nature as compounds.
- Beryllium has two valence electrons; boron, with three valence electrons, shows increasing nonmetallic properties.
Transition Metals and Group Information
- Cadmium is identified as a transition metal among elements in period 5, sandwiched between strontium and iodine.
- When comparing valence electrons, elements X (one valence electron) and Y (one valence electron) share similar properties.
Specific Elements and Compounds
- Carbon is a vital element found in most compounds in the human body, excluding water.
- Sodium chloride is composed of sodium (alkali metal) and chlorine (halogen).
- Strontium (element 38) is more reactive than beryllium (element A) among alkaline earth metals.
Periodic Table Layout
- Elements can be examined across periods or down groups; for example, elements 23 to 26 are looked at across a period.
- Elements in the periodic table display repeating properties from row to row, indicating structured relationships among different element groups.
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