periodicity old exams

8/12/2019 Periodicity Old Exams

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IB Chemistry Periodicity Review Practice

Atomic and ionic radii:

1. In general, atomic radii decreasea) Within a group (family) from low to high atomic number.

b) Within a period from low to high atomic number.

c) With an increase in the shielding of the nuclear charge.d) With an increase in the number of isotopes of an element.

2. Which atom has the smallest atomic radiusa) 1!" b) #1$a c) #%&r d) #'b

#. Which of the following species would you epect to ha*e the largest radius

a) +a b) +#- c) - d) +e

/. 0he radii of the species, +, +, +- decrease in the following order:

a) + + +-

b) + +- +

c) +- + +

d) + + +-

%. In which one of the following pairs of ions is the first ion larger than the second ion

a) -, 3i

b) , 3i

c) 4g2, +a

d) 5l-, &r -

6. What is the order of decreasing radii of the species 7, 72 and 72-

a) 7 72- 72

b) 72- 7 72

c) 7 72 72-

d) 72 7 72-

Ionisation 8nergy re*iew:

1. or the species below, the one which would re9uire the most energy for the remo*al of an

electron is:

a) +a b) c) 5l d) +e

2. or which one of the following series will the first ioniation energies of the elements

increase in the order writtena) ; +e ; +a

b) +a ; 3i ; &e

c) + ; < ; As

#. Which factor parallels increasing ioniation energy

a) Increasing nonmetallic properties c) Increasing atomic radii b) =ecreasing nuclear charge. d) Increasing metallic properties.

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/. 4any of the properties of the elements follow trends, which can be related to patterns in the

<eriodic 0able.

a) <redict the trends in atomic sie you would epect as the <eriodic 0able is crossed:

I. rom left to right

II. rom top to bottom

III. 8plain your predictions.

b) Another property which *aries regularly is ioniation energy.I. =efine ioniation energy, using the element sodium as an eample.

II. Account for the fact that the ioniation energies of the elements generally decrease

from the top to the bottoms of the <eriodic 0able.

III. Account for the fact that the ioniation energies of the noble gases are higher thanthose of the elements immediately before and immediately after them on the <eriodic

0able.

c) Account for the fact that chlorine is a gas and potassium is a solid at room

temperature, e*en though their relati*e atomic masses are *ery similar.

%. Which of the following elements would be epected to ha*e the lowest first ioniation

energy

a) > b) 7i c) 5u d) &a

<eriodicity in $roups and 5hemical amilies:

1.Which of the following properties would not be epected to be a periodic function of the atomicnumber

a) Atomic *olume

b) Ionisation energyc) Atomic mass

d) 8lectronic configuration

2. In which of the following pairs does each ion ha*e a noble gas configuration

a) 5l- and &#-

b) 0e2- and 7-

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c) 5o2 and -

d) &a2 and 7e2-

#.Which pair of species is isoelectronica) - and 5l-

b) +>2- and >#

c) 5l

-

and " d) 5>2 and 572

/.Which germanium, $e, reacts to form a stable compound, it would be epected to attain anelectron configuration similar to that of

a) ?rypton

b) tin

c) arsenicd) argon

%.Which pair of elements has the most similar chemical propertiesa) As and &r

b) As and 7e

c) As and <d) 5 and

6.Which pair of species has most nearly identical propertiesa) 1

1 and 11

b) 1!! and 1!

!-

c) '#3i and 2#

11 +a

d) 1265 and 1#

65

'. Which one of the following compounds would be least li?ely to be formed in a chemical

reactiona) $e72

b) $e#

c) $e/

d) $e5l/

@. 0ellurinium is an element that is in the same family as sulfur. Which of the following would

be the formula of telluric(I) acida) 20e>/

b) 20e>#

c) 20e>2

d) 20e

!. 0hree elements B, C and D ha*e atomic number n, n1 and n2 respecti*ely. B forms stableions B- and D forms stable ions D. Which statement is correct

a) B, C and D all belong to the same period of the <eriodic 0able.

b) C will react readily with D.c) B will react readily with D.

d) B, C and D are all monatomic.

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1E. Which one of the following properties is characteristic of the al?ali metals

a) *ery high melting point

b) elati*ely unreacti*e

c) 3ow first ioniation energyd) 7mallest atomic radius in each period.

11. Which one of the following metals is epected to react least *igorously with watera) 4g b) 5a c) +a d) "

12. 7odium and potassium ha*e similar chemical and physical properties. 0his is best eplained by the fact that both elements

a) are acti*e metals

b) are in $roup I of the periodic table

c) ha*e the same outer electronic configurationd) ha*e low relati*e atomic masses.

1#. 0he trend in the melting points of the $roup I elements shown in the table below is besteplained by:

$roup I melting point o 5

3i 1'! +a !@

" 6/

b #!5s 2@

a) a decrease in the *an der Waals forces with increasing atomic number

b) a decrease in metallic bonding interactions with increasing atomic number c) a decease in the ioniation energy with increasing atomic number

d) a decrease in the atomic radii with increasing atomic number.

1/. Which of the following properties *aryF*aries in the same way with increasing atomic mass

from the al?ali metals and the halogens

I. 8lectronegati*ityII. eacti*ity of the element

III. 4elting point

b) I only

c) I and III onlyd) II and III only

e) I, II and III

1%. 0he chemical family which readily forms anions is the

a) al?ali metals

b) al?aline earth metals (amily 2)c) transition elements

d) halogens

16. Which one of the following properties is not characteristic of the halogens

a) All the elements are coloured.

b) 0heir ionic radii are larger than their corresponding atomic radii.

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c) 0heir oides, when dissol*ed in water, produce acidic solutions.

d) 0heir melting points increase at their atomic number increases.

1'. In what respect does a chlorine atom differ from a chloride iona) 0he atom is a better reducing agent than the ion.

b) 0he atom is larger than the ion

c) 0he atom is less easily oidied than the ion.d) 0he atom has an electron configuration considered to be more stable than that of

the ion.

1@. In comparison with the other halogens, fluorine is the most reacti*e because itsa) molecules ha*e the greatest ?inetic energy at a gi*en temperature

b) oidiing power is the greatest

c) density is the lowest

d) atomic radius is the smallest.

1!. Which one of the following statements concerning the halogen family is I+5>850

a) 0he halide ions are all reducing agents, which fluoride ion the wea?est b) 0he halide ions are more reacti*e than the halogens

c) &romine is obtained from the bromide ion by using chlorine as the oidiing

agent.d) All of the halogens can be obtained by the electrolysis of either an a9ueous

solution of a halide salt or a molten halide salt.

2E. &romide ions, &r -, can be produced by the reaction of bromine, &r 2, with

a) 5l b) 5l- c) I- d) I2

21. Which one of the following properties of the halogens increases with increasing atomicmass

a) Ioniation energy b) &oiling point of the elements

c) tendency to undergo reduction d) electronegati*ity

22. a) ow does the physical state of the halogens *ary from fluorine to iodine >ffer a suitable

eplanation for any *ariations noted.

b) ow does the chemical reacti*ity of the halogens *ary from fluorine to iodine Illustrate

your answer with reference to their reactions with hydrogen and with water.

c) 0he hydrogen halides are all acids, but they are not e9ually strong. 8plain thedifferences in acidity down the family from hydrogen fluoride to hydrogen iodide.

2#. 0he early periodic tables were de*eloped by correlation between the physical and chemical

properties of the elements with their respecti*e atomic masses.

a) 3ist one chemical property and one physical property which leads to the groupingtogether of:

I. 3ithium, sodium and potassium

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'.In which group of the <eriodic 0able are you most li?ely to find a metalloid

a) 0he al?ali metal family

b) 0he al?aline earth family

c) 0he carbon familyd) 0he halogen family

6. 0his 9uestion refers to the elements of the <eriod sodium to argon (+a H Ar).a) =iscuss the type of bonding and the structure of the elements sodium, silicon and

chlorine. or each element, gi*e its physical state at 2% o5 and account, at the

atomicFmolecular le*el, for the state of each.

b) 5onsider magnesium and sulphur:I. <redict the formulae epected for an oide of the element, indicate their

physical states at 2% o5 and account for these states at eh atomicF

molecular le*el.

II. <redict the products of the reaction of each of theses oides with water

and discuss the acidFbase properties of the resulting solutions.

c) =iscuss the trend in the oidiing and reducing ability of the elements in this period

and relate this trend to the atomicFmolecular le*el properties of the elements. Illustrateyour answer, using as eamples two elements of your choice. or each element chosen,

write a balanced e9uation to represent its oidising F reducing beha*iour.

0ransition 4etals:

1.Which one of the following oidation states is not commonly shown by irona) E b) 1 c) 2 d) #

2.Almost all the transition metals in the fourth <eriod (7c to Dn) ha*e se*eral possible oidationstates. All ha*e one oidation state in common and this is the only oidation state for one of them.

0he common oidation state and the uni9ue element are

a) 2 and 4n b) 2 and Dn

c) # and 5r

d) # and e

#.Which of the following statements isFare true An element found in the d-bloc?J of the <eriodic

0able would be epected to

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III. &e a poor conductor of heat and electricity.

I. 8hibit a *ariety of oidation states and colours

. a*e a low melting point and a simple atomic structure.

a) I only b) II only

c) I and II only

d) I and III only.

/. Which of the following properties isFare characteristic of transition metals (d-bloc?) elements

I. 5oloured compoundsII. 4ultiple oidation states

III. 3ow melting points

a) I only

b) I and II onlyc) II and III only

d) I, II and III

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