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Chapter 2: Q44E (page 67)

Write a symbol for each of the following neutral isotopes. Include the atomic number and mass number for each.(a) the chalcogen with a mass number of \({\bf{125}}\)(b) the halogen whose longest-lived isotope is radioactive(c) the noble gas, used in lighting, with \({\bf{10}}\) electrons and \({\bf{10}}\) neutrons(d) the lightest alkali metal with three neutrons

Short Answer

Expert verified

a. \({}_{52}^{125}Te\)

b. \({}_{117}^{294}UUs\)

c. \({}_{10}^{20}Ne\)

d. \({}_3^6Li\)

Step by step solution

01

Write a symbol for the chalcogen with a mass number of 125.

The chalcogen has a mass number of \(125\) is Tellurium \(\left( {Te} \right)\) and its atomic number is \(52\). So, its symbol for neutral isotopes is \({}_{52}^{125}Te\).

02

Write a symbol for the halogen whose longest-lived isotope is radioactive.

The halogen whose longest-lived isotope is radioactive is Ununseptium \(\left( {Uus} \right)\). Its atomic number and mass number is \(117\) and \(294\) respectively. So, its symbol for neutral isotopes is \({}_{117}^{294}UUs\).

03

Write a symbol for the noble gas, used in lighting, with \({\bf{10}}\) electrons and \({\bf{10}}\) neutrons.

The noble gas used in lighting, with \(10\) electrons and \(10\) neutrons is Neon \(\left( {Ne} \right)\) and is an atomic number is also \(10\) as in neutral numbers the atomic number is equal to the number of electrons. The mass number of Neon is \(20\). So, its symbol for neutral isotopes is \({}_{10}^{20}Ne\).

04

Write a symbol for the lightest alkali metal with three neutrons.

The lightest alkali metal with three neutrons is Lithium \(\left( {Li} \right)\). The atomic number and mass number of lithium is \(3\) and \(6\)respectively. So, its symbol for neutral isotopes is \({}_3^6Li\).

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Most popular questions from this chapter

Explain why the symbol for an atom of the element oxygen and the formula for a molecule of oxygen differ.

Which postulate of Dalton鈥檚 theory is consistent with the following observation concerning the weights of reactants and products? When 100 grams of solid calcium carbonate is heated, 44 grams of carbon dioxide and 56 grams of calcium oxide are produced.

Open the Build a Molecule simulation (http://openstaxcollege.org/l/16molbuilding) and select the 鈥淟arger Molecules鈥� tab. Select an appropriate atoms 鈥淜it鈥� to build a molecule with two carbon and six hydrogen atoms. Drag atoms into the space above the 鈥淜it鈥� to make a molecule. A name will appear when you have made an actual molecule that exists (even if it is not the one you want). You can use the scissors tool to separate atoms if you would like to change the connections. Click on 鈥�3D鈥� to see the molecule, and look at both the space-filling and ball and-stick possibilities.(a) Draw the structural formula of this molecule and state its name.(b) Can you arrange these atoms in any way to make a different compound?

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

Use the Build a Molecule simulation (http://openstaxcollege.org/l/16molbuilding) to repeat Exercise 2.34, but build a molecule with two carbons, six hydrogens, and one oxygen.(a) Draw the structural formula of this molecule and state its name.(b) Can you arrange these atoms to make a different molecule? If so, draw its structural formula and state its name.(c) How are the molecules drawn in (a) and (b) the same? How do they differ? What are they called (the type of relationship between these molecules, not their names)?
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