The arrangements of electrons in atoms and ions are often written in simplified form, known as 'condensed electron configurations'. For example, the condensed electron configuration of beryllium is written as [He]2s² where [He] stands for the electron configuration of helium (1s²), which is the noble gas element previous to beryllium in the periodic table. a. Write condensed electron configurations for the following atoms and ions. i. C ii. Fe iii. Fe^3+ b. State the group and period of the periodic table where an element with the electron configuration [Kr]4d¹⁰5s²5p⁶ is found. group ____________ period ____________

SSCE VCE Chemistry Chemical Elements: The arrangements of electrons in

The arrangements of electrons in atoms and ions are often written in simplified form, known as 'condensed electron configurations' - VCE - SSCE Chemistry - Question 3 - 2007 - Paper 1

Question 3

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The arrangements of electrons in atoms and ions are often written in simplified form, known as 'condensed electron configurations'. For example, the condensed electr... show full transcript

Worked Solution & Example Answer:The arrangements of electrons in atoms and ions are often written in simplified form, known as 'condensed electron configurations' - VCE - SSCE Chemistry - Question 3 - 2007 - Paper 1

Step 1

i. C

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Answer

The condensed electron configuration for carbon (C) is written as:

$[He]2s^2 2p^2$

This indicates that carbon has a total of 6 electrons with 2 electrons in the 2s subshell and 4 in the 2p subshell.

Step 2

ii. Fe

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Answer

The condensed electron configuration for iron (Fe) is as follows:

$[Ar]4s^2 3d^6$

This shows that iron has a total of 26 electrons, with 2 in the 4s subshell and 6 in the 3d subshell.

Step 3

iii. Fe^3+

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Answer

For the iron ion Fe^3+, the condensed electron configuration is:

$[Ar]4s^0 3d^5$

This reflects the loss of 3 electrons (2 from the 4s and 1 from the 3d subshell) resulting in a total of 23 electrons.

Step 4

b. State the group and period of the periodic table where an element with the electron configuration [Kr]4d^{10}5s^{2}5p^{6} is found.

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The given electron configuration corresponds to an element in Group 18 (noble gases) and Period 5. Both of these indicate that it is a noble gas element, specifically xenon.

The arrangements of electrons in atoms and ions are often written in simplified form, known as 'condensed electron configurations' - VCE - SSCE Chemistry - Question 3 - 2007 - Paper 1

Worked Solution & Example Answer:The arrangements of electrons in atoms and ions are often written in simplified form, known as 'condensed electron configurations' - VCE - SSCE Chemistry - Question 3 - 2007 - Paper 1

i. C

ii. Fe

iii. Fe^3+

b. State the group and period of the periodic table where an element with the electron configuration [Kr]4d^{10}5s^{2}5p^{6} is found.

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