Chapter 7 periodicity Flashcards

1
Q

Describe the periodic table Mendeleev created

A
  • arranged in order of atomic mass
  • He lines elements in groups with similar properties
  • if the elements did not fit the similar properties he would switch them and leave gasp
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2
Q

Describe the modern periodic table

A
  • from left to right elements are arranged in order of increasing atom number
  • each successive element has atoms with one extra proton
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3
Q

What are groups

A
  • vertical columns
  • each element in group has atoms with the same number of outer shell electrons
  • similar properties
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4
Q

What are periods

A
  • horizontal rows
  • the highest energy electron shell in an element’s atom
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5
Q

What is periodicity

A

the repeating trend in properties of the elements

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6
Q

What is the s block

A

highest energy electron in an s orbital

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7
Q

What is an element in the p block

A

highest energy electron in the p orbital

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8
Q

What is ionisation energy

A
  • how easily an atom loses electrons to form a positive ion
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9
Q

What is the first ionisation energy

A
  • the energy required to remove one electron from each atom in one mole of gasours atoms of an element to form one mole of gaseous 1+ ions
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10
Q

What factors affet ionisation energy

A
  • atomic radius
  • nuclear charge
  • electron shielding
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11
Q

How does atomic radius affect ionisation energy

A
  • the greater the distance between nucleus and outer electrons with the less nuclear attraction
  • the force of attraction falls with increasing distance
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12
Q

How does nuclear charge affect ionisation energy

A
  • the more protons there are in the nucleus of an atom the greater the attraction between nucleus and outer electrons
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13
Q

How does electron shielding affect ionisation energy

A
  • electrons are negativley charges so inner shell electrons repel outer shell electrons
  • the repulsion is shielding reducing the attraction betwene nucleus and outer electrons
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14
Q

How do you know how many successive ionisation energies an element has

A
  • same number as electrons
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15
Q

Describe the second ionisation energy in helium

A
  • greater than the first ionisation energy
  • two protons attracting two electrons in te 1s sub shell
  • after first electron lost single electron puller closer to the nucleus
  • nuclear attraction incresases so more ionisation energy needed to remove this second electron
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16
Q

What is the second ionisation energy

A
  • is the energy required to remove one electron from each ion in one mole of gaseous 1+ ions of an element to form one mole of gaseous 2+ ions
17
Q

How do you predict ionisation energies from a table

A
  • see where the largest jump is in ioisation eergies
  • the amount of ionisation energies till the jump is the number of electrons in its outer shell
  • therfore you can see the group of the element
18
Q

Describe the successive ionisation energies in a graph

A
  • large jumps are change in shells
  • small jumps are change in sub shells
19
Q

Describe the two key patterns in the first 20 key elements in ionisation energy in a periodic table

A
  • general increase in first ionisation energy across each period (H-> He, LI-> Ne, Na-Ar)
  • a sharp decrease in first ionidation energy between the end of one period and the start of the next period (He-> Li, Ne-Na, Ar->K)
20
Q

Decribe the trend on ionisation energy down a group

A
  • atomic raidus increases
  • more inner shells so shieldong increases
  • nucelar attraction on outer electrons decreases
  • first ionisation energy decreases
21
Q

Describe the trend of first ionisation energy across a period

A
  • nuclear charge increases
  • same shell similar shielding
  • nuclear attraction increases
  • atomic radius decreases
  • first ionisation energy increases
22
Q

Compare the ionisation energy between beyillum and boron

A
  • the 2p sub shell in boron has a higher energy than the 2s sub shell in beryillium
  • ttherefore boron the 2p electron is easieer to remove than one of the 2 electrons in beryllium
  • the first ionisation energy of boron is less that the frist ionisation energy of beryllium
23
Q

Compare the ionisation energy between nitrogen and oxygen

A
  • in nitrogen and oxygen the highest energy electrons are in 2p sub shells
  • in pxygen paired elecrons in one of the 2p orbitals repel one another making it easier to remove en electron from an oxygen atom than a nitrogen atom
  • therefore the first ionisation energu of oxygen is less than the first ionisation energy of nitrogen
24
Q

Describe the structure of metals

A
  • in a solid structure each ato has donated its negative outer shell electrons to a shared poll of electrons delocalised throughout whole structure
  • positvie ions left behind consist of nucleus and the inner electron shells of metal atoms
  • cations are fixed in positions maintaining structure
  • delicalised electrons are movile and are able to move throughout the structure
25
Q

What is metallic bonding

A
  • strong electrostatic attraction between cations and delocalised electrons
26
Q

What is the main structure of metals

A

giant metallic lattice

27
Q

Why can metals conduct electricity

A
  • can conduct in solid and liquid stated
  • delocalise electrons can move throught structue carrying charge
28
Q

Descrube why metals have high melting and boiling points

A
  • large amount of energy needed to overcome the strong electrostatic attraction between cations and electrons
  • higher in those whose electrostatic charge is larger because they have a larger charge on atom which makes them smaller and more delocalised electrons
29
Q

Describe the solubulity of metals

A
  • they do not dissolve
30
Q

Describe giant covalent structures and what elements have these structures

A
  • boron ,carbon and silicon
  • instead of small molecules and intemolecular forces billions of atoms held with strong covalent bonds to from a giant covalent lattice
  • carbon and silicon bond to other carbon and silicon atoms forming a tetrahedral structure
31
Q

Describe the structure of diamond

A
  • tetrahedral arrangment
  • bond angles are 109.5 by electron pair repulsion
32
Q

What are the melting and boiling like of giant covalent structures

A
  • high melting and boiling points
  • covalent bonds are strong
  • large quantity of energy to break strong covalent bonds
33
Q

Describe the solubility of giant covalent structures

A
  • insoluble
  • covalent bonds holding together atoms in the lattice are far too strong to be broken by interactin with solvents
34
Q

Describe the electrical conductivity of giant covalent structures

A
  • non conductors of electricity
  • except graphene and graphite - they only form 3 covalent bonds so one atom is delocalised which can carry a charge round structure
35
Q

Describe the trends in metling and boiling point in period 2

A
  • Li-Be - giant metallic lattice - strong metallic bonds between cations and delocalised electrons
  • B-C - giant covalent structures -strong covalent bonds between atoms
  • N2-Ne - simple molecular structure 0 weak london forces between molecules
36
Q

Describe the trend in in melting and boiling points in period 3

A
  • Na-Al- - giant metallic lattice - strong metallic bonds between cations and delocalised electrons
  • Si- giant covalent structures -strong covalent bonds between atoms
  • P4,S8,Cl2,Ar - simple molecular structure 0 weak london forces between molecules