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Questions and Answers
What explains why the atomic mass of germanium (Ge) is a fraction between 72 and 73?
What explains why the atomic mass of germanium (Ge) is a fraction between 72 and 73?
- The presence of neutrons
- The presence of protons
- The presence of electrons
- The presence of different isotopes (correct)
What does the nucleus of an atom contain?
What does the nucleus of an atom contain?
Protons and neutrons
What does the mass number of an atom represent?
What does the mass number of an atom represent?
Total number of protons and neutrons in the atom
What element was originally named argentum?
What element was originally named argentum?
What element was originally named stannum?
What element was originally named stannum?
Which of the following pairs represent isotopes?
Which of the following pairs represent isotopes?
Neutral atoms of all isotopes of a given element have the same...
Neutral atoms of all isotopes of a given element have the same...
What is the approximate natural abundance of ¹⁵¹Eu if the atomic mass of Eu is 151.96?
What is the approximate natural abundance of ¹⁵¹Eu if the atomic mass of Eu is 151.96?
How many protons are in an atom of Fe?
How many protons are in an atom of Fe?
What is the mass number for an atom of xenon containing 54 protons and 80 neutrons?
What is the mass number for an atom of xenon containing 54 protons and 80 neutrons?
What is the atomic symbol and mass number for an atom containing 50 protons and 64 neutrons?
What is the atomic symbol and mass number for an atom containing 50 protons and 64 neutrons?
Of the following compounds, which contains a metalloid?
Of the following compounds, which contains a metalloid?
The element symbol for potassium is _____
The element symbol for potassium is _____
The element symbol for tungsten is _____
The element symbol for tungsten is _____
The halogens are found in Group ____
The halogens are found in Group ____
The symbol Hg represents the element...
The symbol Hg represents the element...
What group (G) and period (P) does the element molybdenum (Mo) belong to?
What group (G) and period (P) does the element molybdenum (Mo) belong to?
What is the atomic symbol for the element in Group 5A (15) and the fifth period?
What is the atomic symbol for the element in Group 5A (15) and the fifth period?
Which of the following does NOT describe the element bromine (Br)?
Which of the following does NOT describe the element bromine (Br)?
Which of the following elements would be chemically similar to selenium (Se)?
Which of the following elements would be chemically similar to selenium (Se)?
Which of the following is an alkaline earth metal?
Which of the following is an alkaline earth metal?
Similar properties recur periodically when elements are arranged according to increasing atomic number is the statement of the ______.
Similar properties recur periodically when elements are arranged according to increasing atomic number is the statement of the ______.
What is the formula of a compound containing K⁺ and O²⁻ ions?
What is the formula of a compound containing K⁺ and O²⁻ ions?
Which is true about one formula unit of CaBr₂?
Which is true about one formula unit of CaBr₂?
Which of the following compounds exhibits both ionic and covalent bonding?
Which of the following compounds exhibits both ionic and covalent bonding?
Which of the following is best classified as a covalent compound?
Which of the following is best classified as a covalent compound?
Which of the following is most likely to form a +2 ion?
Which of the following is most likely to form a +2 ion?
Determine the number of protons (p) and electrons (e) in N³⁻.
Determine the number of protons (p) and electrons (e) in N³⁻.
How many protons (p) and electrons (e) are found in a Se²⁻ ion?
How many protons (p) and electrons (e) are found in a Se²⁻ ion?
Which of the following is most likely to make a -3 ion?
Which of the following is most likely to make a -3 ion?
The formula of europium oxide is Eu₂O₃. Based on this information, what is the formula of the compound made from europium and chloride ions?
The formula of europium oxide is Eu₂O₃. Based on this information, what is the formula of the compound made from europium and chloride ions?
Determine the correct formula for aluminum oxide.
Determine the correct formula for aluminum oxide.
Determine the correct formula for iron(III) perchlorate.
Determine the correct formula for iron(III) perchlorate.
Determine the correct formula for titanium(IV) chloride.
Determine the correct formula for titanium(IV) chloride.
What is the correct formula for cobalt(III) hydroxide?
What is the correct formula for cobalt(III) hydroxide?
Which has the correct name-formula combination?
Which has the correct name-formula combination?
Which has the incorrect name-formula combination?
Which has the incorrect name-formula combination?
Predict the chemical formula for the ionic compound formed by Al³⁺ and C₂H₃O₂⁻.
Predict the chemical formula for the ionic compound formed by Al³⁺ and C₂H₃O₂⁻.
Study Notes
Atomic Mass and Isotopes
- Atomic mass of germanium (Ge) is 72.630 amu, indicating the presence of multiple isotopes.
- Isotopes are variants of elements with different numbers of neutrons but the same number of protons.
Atomic Structure
- Nucleus of an atom consists of protons and neutrons.
- Mass number equals the total number of protons and neutrons in an atom.
- Neutral atoms of the same element (regardless of isotopes) maintain the same electron count.
Element Names and Symbols
- Argentum is the original name for silver.
- Stannum refers to tin.
- Element symbol for potassium is K, and for tungsten, it is W.
Isotope Representation
- Examples of isotopes include ²⁸Si (Silicon-28) and ²⁹Si (Silicon-29).
- Europium has two naturally occurring isotopes: ¹⁵¹Eu and ¹⁵³Eu.
Protons and Mass Numbers
- Iron (Fe) has 26 protons.
- Xenon with 54 protons and 80 neutrons has a mass number of 134.
- The atomic symbol for an atom with 50 protons and 64 neutrons is ¹¹⁴Sn.
Groups and Periods in the Periodic Table
- Molybdenum (Mo) is located in group 6 and period 5.
- The element in Group 5A (15) and the fifth period has the atomic symbol Sb.
Chemical Properties and Classification
- Bromine (Br) is incorrectly described as a nonmetal.
- Selenium (Se) shares chemical properties with sulfur (S).
- Beryllium (Be) is classified as an alkaline earth metal.
Periodic Trends
- The statement "similar properties recur periodically" defines the Periodic Law.
Chemical Formulas and Ionic Compounds
- Compound formula for potassium and oxide ions is K₂O.
- One formula unit of CaBr₂ contains one Ca ion and two Br ions.
- KNO₃ exhibits both ionic (K⁺) and covalent (nitrate ion) bonding.
- N₂O₅ is an example of a covalent compound between nonmetals.
Protons, Electrons, and Ions
- N³⁻ has 7 protons and 10 electrons.
- Se²⁻ has 34 protons and 36 electrons.
- Magnesium (Mg) is likely to form a +2 ion.
Compound Formulas
- Aluminium oxide is represented by Al₂O₃.
- Iron(III) perchlorate has the formula Fe(ClO₄)₃.
- Titanium(IV) chloride is denoted as TiCl₄.
- Cobalt(III) hydroxide is correctly represented as Co(OH)₃.
Name-Formula Combinations
- Barium oxide correlates with the formula BaO.
- The combination for iron(II) chlorate is mistakenly shown as FeClO₄.
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Test your knowledge with these flashcards focusing on key concepts in chemistry such as atomic mass, isotopes, and atomic structure. Perfect for homework review or exam preparation.
