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Chapter 2: Problem 55

In the periodic table, how many elements are found in each of the following? a. Group 2A b. the oxygen family c. the nickel group d. Group 8A

Short Answer

Expert verified
In the periodic table, there are: a. \(6\) elements in Group 2A (alkali earth metals): beryllium, magnesium, calcium, strontium, barium, and radium. b. \(5\) elements in the oxygen family (chalcogens): oxygen, sulfur, selenium, tellurium, and polonium. c. \(3\) elements in the nickel group (transition metals): nickel, palladium, and platinum. d. \(6\) elements in Group 8A (noble gases): helium, neon, argon, krypton, xenon, and radon.

Step by step solution

01

Defining Group 2A

Group 2A elements are also called alkali earth metals. They are found in the second column of the periodic table, and they include the elements beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
02

Counting elements in Group 2A

Since there are six elements present in Group 2A: beryllium, magnesium, calcium, strontium, barium, and radium, the answer is six.
03

Defining the oxygen family

The oxygen family, also known as the chalcogens, is found in Group 6A or Group 16 of the periodic table. The elements in the oxygen family are oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and polonium (Po).
04

Counting elements in the oxygen family

Since there are five elements present in the oxygen family: oxygen, sulfur, selenium, tellurium, and polonium, the answer is five.
05

Defining the nickel group

The nickel group is part of the transition metals and is in Group 10 of the periodic table. The elements belonging to the nickel group are nickel (Ni), palladium (Pd), and platinum (Pt).
06

Counting elements in the nickel group

Since there are three elements present in the nickel group: nickel, palladium, and platinum, the answer is three.
07

Defining Group 8A

Group 8A elements are also known as noble gases. They are found in the last column of the periodic table and include elements such as helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
08

Counting elements in Group 8A

Since there are six elements present in Group 8A: helium, neon, argon, krypton, xenon, and radon, the answer is six.

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Most popular questions from this chapter

Write the symbol of each atom using the \(\left(_{Z}^{A} X\right)\) format.

Which of the following is(are) correct? a. \(^{40} \mathrm{Ca}^{2+}\) contains 20 protons and 18 electrons. b. Rutherford created the cathode-ray tube and was the founder of the charge- to-mass ratio of an electron. c. An electron is heavier than a proton. d. The nucleus contains protons, neutrons, and electrons

Which of the following statements is(are) true? For the false statements, correct them. a. All particles in the nucleus of an atom are charged. b. The atom is best described as a uniform sphere of matter in which electrons are embedded. c. The mass of the nucleus is only a very small fraction of the mass of the entire atom. d. The volume of the nucleus is only a very small fraction of the total volume of the atom. e. The number of neutrons in a neutral atom must equal the number of electrons.

a. Classify the following elements as metals or nonmetals: $$\begin{array}{lll}\mathrm{Mg} & \mathrm{Si} & \mathrm{Rn} \\ \mathrm{Ti} & \mathrm{Ge} & \mathrm{Eu} \\ \mathrm{Au} & \mathrm{B} & \mathrm{Am} \\\ \mathrm{Bi} & \mathrm{At} & \mathrm{Br}\end{array}$$ b. The distinction between metals and nonmetals is really not a clear one. Some elements, called metalloids, are intermediate in their properties. Which of these elements would you reclassify as metalloids? What other elements in the periodic table would you expect to be metalloids?

Write the formula for each of the following compounds: a. chromium(VI) oxide b. disulfur dichloride c. nickel(II) fluoride d. potassium hydrogen phosphate e. aluminum nitride f. ammonia g. manganese(IV) sulfide h. sodium dichromate i. ammonium sulfite j. carbon tetraiodide
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