June 2016 Paper 1 Flashcards
This question is about electron configuration.
Give the full electron configuration of an Al atom and of a Cr3+ ion.
Al atom :
Cr3+ ion :
This question is about electron configuration.
Give the full electron configuration of an Al atom and of a Cr3+ ion.
Al atom : 1s2 2s2 2p6 3s2 3p1
Cr3+ ion : 1s2 2s2 2p6 3s2 3p6 3d3
Give the electron configurations for copper and chromium and state why these exceptions apply to only these elements
In the case of chromium by …
Cr:
In the case of copper by …
Cu:
The 3d sub shell is more stable when its either half full or completely full
In the case of chromium by only having one electron in the 4s sub shell, it can have a full 3d sub shell
Cr: 1s2 2s2 2p6 3s2 3p6 3d5 4s1
In the case of copper by only having one electron in the 4s sub-shell it can have a completely full 3d sub shell
Cu: 1s2 2s2 2p6 3s2 3p6 3d10 4s1
The trend of atomic radius?
State why
The trend of atomic radius?
Atomic radius increases down a group and across a period from the left to right
This is caused by the increase in the number of protons and electrons across a period. (One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius. Atomic radius increases from top to bottom within a group. This is caused by electron shielding.)
Which of these atoms has the largest radius?
Mg
Na
Ar
Cl
Na
Which of these atoms has the smallest number of neutrons
3H
4He
5He
4Li
Li
7-4
=3
Which change requires the largest amount of energy?
He+(g) —-> He2+(g) + e-
Li(g) —-> Li+(g) + e-
Mg+(g) ——> Mg2+(g) + e-
N(g) —> N+(g) + e-
He+ —-> He2+(g) + e-
Which one of the following is a correct electron arrangement?
A Cu+ is [Ar]3d94s1
B Cu is [Ar]3d104s2
C Cu2+ is [Ar]3d84s1
D Cu+ is [Ar]3d10
Which one of the following is a correct electron arrangement?
D Cu+ is [Ar]3d10
Chlorine has two isotopes, 35Cl and 37Cl. The number of molecular ion peaks in the mass spectrum of a sampleofCl2 is
A 2
B 3
C 4
D 5
3
Use the Periodic Table to deduce the full electron configuration of calcium.
Use the Periodic Table to deduce the full electron configuration of calcium.
1s2 2s2 2p6 3s2 3p6 4s2
What products are formed in the reaction of calcium and excess water
Calcium hydroxide and hydrogen gas are generated when calcium reacts with water. This is a single displacement reaction.
Write an ionic equation, with state symbols, to show the reaction of calcium with an excess of water
State the role of water in the reaction with calcium
Ca(s)+ 2H O(l) Ca2+(aq) + 2OH–(aq) + H (g)
Oxidising agent
Write an equation to show the process that occurs when the first ionisation energy of calcium is measured.
Write an equation to show the process that occurs when the first ionisation energy of calcium is measured.
Ca(g) —-> Ca+(g) + e-
State and explain the trend in the first ionisation energies of the elements in Group 2 from magnesium to barium
Trend:
Explanation …
State and explain the trend in the first ionisation energies of the elements in Group 2 from magnesium to barium
Trend: decrease
Explanation: Ions get bigger so
Weaker attraction of ion to lost electron
This question is about the elements in Period 3 of the Periodic Table.
State the element in Period 3 that has the highest melting point. Explain your answer
Sillicon
Has many covalent bonds that require a lot of energy to break
State the element in Period 3 that has the highest first ionisation energy. Explain your answer.
Element
Explanation
State the element in Period 3 that has the highest first ionisation energy. Explain your answer.
Element
Argon
Explanation
Large(st) number of protons
Same amount of shielding
