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Chapter 2: Q43E (page 124)

Write a symbol for each of the following neutral isotopes. Include the atomic number and mass number for each.

(a) the alkali metal with 11 protons and a mass number of 23

(b) the noble gas element with 75 neutrons in its nucleus and 54 electrons in the neutral atom

(c) the isotope with 33 protons and 40 neutrons in its nucleus

(d) the alkaline earth metal with 88 electrons and 138 neutrons

Short Answer

Expert verified

a. Symbol 鈥�23Na11

b. Symbol 鈥� 129Xe54

c. Symbol - 73As33

d. Symbol 鈥� 226Ra88

Step by step solution

01

General Representation

NumberZXY Atomic Number

02

Alkali metal symbol

Number of protons = Atomic Number.Sodium has atomic number 11 and mass number 23. Thus, symbol is 23Na11

03

Noble gas symbol

Numbers of electrons = numbers of Protons for a neutral atom.So, the element has 54 protons. Mass number is=75+54 =129. Thus, the element is Xenon and symbol is 29Xe54

04

Isotope symbol

Mass number = 40+33 = 73, atomic number is 33.Element is Arsenic. Thus, the symbol is 73As33

05

Alkaline earth metal symbol

In this element atomic number is 88.As numbers of electrons = numbers of Protons for a neutral atom,Mass number is =138+88 =216. The element is Radon. Thus, the symbol is 226Ra88

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Most popular questions from this chapter

Question: Write the formulas of the following compounds:

(a) rubidium bromide

(b) magnesium selenide

(c) sodium oxide

(d) calcium chloride

(e) hydrogen fluoride

(f) gallium phosphide

(g) aluminum bromide

(h) ammonium sulfate

The average atomic masses of some elements may vary, depending upon the sources of their ores. Naturally occurring, the boron consists of two isotopes with accurately known masses ( 10B, 10.0129 amu and 11B, 11.0931 amu). The actual atomic mass of boron can vary from 10.807 to 10.819, depending on whether the mineral source is from Turkey or the United States. Calculate the percent abundance leading to the two values of the average atomic masses of boron from these two countries.

Each of the following compounds contains a metal that can exhibit more than one ionic charge. Name these compounds:

a. NiCO3

b. MoO3

c.Co(NO3)2

d. V2O5

e. MnO2

f. Fe2O3

Click on the site (http://openstaxcollege.org/l/16PhetAtomMass) and select the 鈥淢ix Isotopes鈥� tab, hide the 鈥淧ercent Composition鈥� and 鈥淎verage Atomic Mass鈥� boxes, and then select the element boron.

(a) Write the symbols of the isotopes of boron that are shown as naturally occurring in significant amounts.

(b) Predict the relative amounts (percentages) of these boron isotopes found in nature. Explain the reasoning behind your choice.

(c) Add isotopes to the black box to make a mixture that matches your prediction in (b). You may drag isotopes fromtheir bins or click on 鈥淢ore鈥� and then move the sliders to the appropriate amounts.

(d) Reveal the 鈥淧ercent Composition鈥� and 鈥淎verage Atomic Mass鈥� boxes. How well does your mixture match withyour prediction? If necessary, adjust the isotope amounts to match your prediction.

(e) Select 鈥淣ature鈥檚鈥� mix of isotopes and compare it to your prediction. How well does your prediction comparewith the naturally occurring mixture? Explain. If necessary, adjust your amounts to make them match 鈥淣ature鈥檚鈥漚mounts as closely as possible.

Using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main-group (representative) element, transition metal, or inner transition metal:

(a) cobalt

(b) europium

(c) iodine

(d) indium

(e) lithium

(f) oxygen

(h) cadmium

(i) terbium

(j) rhenium
See all solutions

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