Concept explainers
Interpretation:
From the given set of statements, the true statements need to be determined.
Concept introduction:
The periodic table is defined as an arrangement of the chemical elements. The periodic table is divided into the rows and the column. The elements which have the same atomic number are present in the rows and the elements which have similar atomic structure are present in the vertical column.
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Chapter 2 Solutions
Chemistry: Principles and Reactions
- What are the live most abundant elements (by mass) in the earth’s crust, oceans, and atmosphere?arrow_forwardArrange the following in the order of increasing mass. (a) a potassium ion, K+ (b) a phosphorus molecule, P4 (c) a potassium atom (d) a platinum atomarrow_forward2-69 (Chemical Connections 2A) Why does the body need sulfur, calcium, and iron?arrow_forward
- From the following written description, write the balanced chemical equation for the reaction including state symbols. A diatomic gaseous molecule that contains 17 protons per atom is reacted with a solid element that has an atomic number of 19 to yield an ionic compound.arrow_forwardWhat evidence led to the conclusion that cathode rays had a negative charge?arrow_forward2-73 (Chemical Connections 2D) Copper is a soft metal. how can it be made harder?arrow_forward
- 2-17 How does Dalton’s atomic theory explain: (a) the law of conservation of mass? (b) the law of constant composition?arrow_forwardMass spectrometric analysis showed that there are four isotopes of an unknown element having the following masses and abundances: Three elements in the periodic table that have atomic weights near these values are lanthanum (La), atomic number 57, atomic weight 138.9055; cerium (Ce), atomic number 58, atomic weight 140.115; and praseodymium (Pr), atomic number 59, atomic weight 140.9076. Using the data above, calculate the atomic weight, and identify the element if possible.arrow_forward2.46 Why are nonmetals important even though they account for only a very small fraction of the elements in the periodic table?arrow_forward
- v. Answer true or false. (a) Mendeleev discovered that, when elements are arranged in order of increasing atomic weight, certain sets of properties recur periodically. (b) Main-group elements are those in the columns 3A to 8A of the Periodic Table. (e) Nonmetals are found at the top of the Periodic Table, metalloids in the middle, and metals at the bottom. (d) Among the 116 known elements, there are approximately equal numbers of metals and nonmetals. (e) A horizontal row in the Periodic Table is called a group. () The Group 1A elements are called the "alkali metals." (g) The alkali metals react with water to give hydrogen gas and a metal hydroxide, MOH, where “M" is the metal. (h) The halogens are Group 7A elements. (1) The boiling points of noble gases (Group 8A elements) increase in going from top to bottom of the column.arrow_forwardAn element has nine protons and 10 neutrons in the neutral atom. (a) How many electrons are present in the neutral atom? (b) What is the atomic number of this element? (c) Identify the element.arrow_forwardA sample of an ionic compound containing iron and chlorineis analyzed and found to have a molar mass of 126.8 g>mol.What is the charge of the iron in this compound?(a) 1+ (b) 2+ (c) 3+ (d) 4+arrow_forward
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