Questions and Answers
What explains why the atomic mass of germanium (Ge) is a fraction between 72 and 73?
What does the nucleus of an atom contain?
Protons and neutrons
What does the mass number of an atom represent?
Total number of protons and neutrons in the atom
What element was originally named argentum?
Signup and view all the answers
What element was originally named stannum?
Signup and view all the answers
Which of the following pairs represent isotopes?
Signup and view all the answers
Neutral atoms of all isotopes of a given element have the same...
Signup and view all the answers
What is the approximate natural abundance of ¹⁵¹Eu if the atomic mass of Eu is 151.96?
Signup and view all the answers
How many protons are in an atom of Fe?
Signup and view all the answers
What is the mass number for an atom of xenon containing 54 protons and 80 neutrons?
Signup and view all the answers
What is the atomic symbol and mass number for an atom containing 50 protons and 64 neutrons?
Signup and view all the answers
Of the following compounds, which contains a metalloid?
Signup and view all the answers
The element symbol for potassium is _____
Signup and view all the answers
The element symbol for tungsten is _____
Signup and view all the answers
The halogens are found in Group ____
Signup and view all the answers
The symbol Hg represents the element...
Signup and view all the answers
What group (G) and period (P) does the element molybdenum (Mo) belong to?
Signup and view all the answers
What is the atomic symbol for the element in Group 5A (15) and the fifth period?
Signup and view all the answers
Which of the following does NOT describe the element bromine (Br)?
Signup and view all the answers
Which of the following elements would be chemically similar to selenium (Se)?
Signup and view all the answers
Which of the following is an alkaline earth metal?
Signup and view all the answers
Similar properties recur periodically when elements are arranged according to increasing atomic number is the statement of the ______.
Signup and view all the answers
What is the formula of a compound containing K⁺ and O²⁻ ions?
Signup and view all the answers
Which is true about one formula unit of CaBr₂?
Signup and view all the answers
Which of the following compounds exhibits both ionic and covalent bonding?
Signup and view all the answers
Which of the following is best classified as a covalent compound?
Signup and view all the answers
Which of the following is most likely to form a +2 ion?
Signup and view all the answers
Determine the number of protons (p) and electrons (e) in N³⁻.
Signup and view all the answers
How many protons (p) and electrons (e) are found in a Se²⁻ ion?
Signup and view all the answers
Which of the following is most likely to make a -3 ion?
Signup and view all the answers
The formula of europium oxide is Eu₂O₃. Based on this information, what is the formula of the compound made from europium and chloride ions?
Signup and view all the answers
Determine the correct formula for aluminum oxide.
Signup and view all the answers
Determine the correct formula for iron(III) perchlorate.
Signup and view all the answers
Determine the correct formula for titanium(IV) chloride.
Signup and view all the answers
What is the correct formula for cobalt(III) hydroxide?
Signup and view all the answers
Which has the correct name-formula combination?
Signup and view all the answers
Which has the incorrect name-formula combination?
Signup and view all the answers
Predict the chemical formula for the ionic compound formed by Al³⁺ and C₂H₃O₂⁻.
Signup and view all the answers
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
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.
