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Chapter 2: Q40E (page 124)

Using the periodic table, identify the heaviest member of each of the following groups:

(a) Alkali metals

(b) Chalcogens

(c) Noble gases

(d) Alkaline earth metals

Short Answer

Expert verified

(a) The heaviest member of the alkali metal group is francium (223Fr87)

(b) The heaviest member of the chalcogens group is polonium (209Po84)

(c) The heaviest member of the Nobel gas group is radon (222Rn86)

(d) The heaviest member of the alkaline earth metal is radium (224Ra88).

Step by step solution

01

Explanation

(a) The last member of alkali group is Fr, so it has most number of protons and neutrons, and hence, it is heaviest.

(b) The last member of chalcogens is Po, so it is heaviest.

(c) The last member of noble gases is Rn, so it is heaviest.

(d) The last member of alkaline earth metal is Ra, so it is heaviest.

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Most popular questions from this chapter

Question : Write the formulas of the following compounds:

(a) lithium carbonate

(b) sodium perchlorate

(c) barium hydroxide

(d) ammonium carbonate

(e) sulfuric acid

(f) calcium acetate

(g) magnesium phosphate

(h) sodium sulfite

Write the symbol for each of the following ions: (a) the ion with a \(1 + \) charge, atomic number \(55,\) and mass number \(133\)(b) the ion with \(54\) electrons, \(53\) protons, and \(74\) neutrons (c) the ion with atomic number\(15,\) mass number \(31,\) and a \(3 - \) charge (d) the ion with \(24\) electrons, \(30\) neutrons, and a \(3 + \)charge

Predict and test the behaviour of 伪 particles fired at a Rutherford atom model.

(a) Predict the paths taken by 伪 particles that are fired at atoms with a Rutherford atom model structure. Explain why you expect the 伪 particles to take these paths.

(b) If 伪 particles of higher energy than those in (a) are fired at Rutherford atoms, predict how their paths will differ from the lower-energy 伪 particle paths. Explain your reasoning.

(c) Predict how the paths taken by the 伪 particles will differ if they are fired at Rutherford atoms of elements other than gold. What factor do you expect to cause this difference in paths, and why?

(d) Now test your predictions from (a), (b), and (c).

Open the Rutherford Scattering simulation (http://openstaxcollege.org/l/16PhetScatter) and select the 鈥淩utherford Atom鈥� tab. Due to the scale of the simulation, it is best to start with a small nucleus, so select 鈥�20鈥� for both protons and neutrons, 鈥渕in鈥� for energy, show traces, and then start firing 伪 particles. Does this match your prediction from (a)? If not, explain why the actual path would be that shown in the simulation. Pause or reset, set energy to 鈥渕ax,鈥� and start firing 伪 particles. Does this match your prediction from (b)? If not, explain the effect of increased energy on the actual path as shown in the simulation. Pause or reset, select 鈥�40鈥� for both protons and neutrons, 鈥渕in鈥� for energy, show traces, and fire away. Does this match your prediction from (c)? If not, explain why the actual path would be that shown in the simulation. Repeat this with larger numbers of protons and neutrons. What generalization can you make regarding the type of atom and effect on the path of 伪 particles? Be clear and specific.

Write the molecular and empirical formulas of the following compounds:\(\begin{aligned}{}a)O = C = O\\b)H - C \equiv C - H\end{aligned}\)

c)

(d)

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
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