1. the D block Flashcards

1
Q

most of the elements in the d block are

A

transition elements

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2
Q

the d block is in the _____ of the periodic table

A

middle

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3
Q

definition of a transition element

A

a transition element is a d-block element that can form at least one stable ion with an incomplete d subshell

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4
Q

how is chromium unusual

A

prefers to have one electron in each orbital of the 3d subshell and just 1 in the 4s subshell (gives it more stability)
Cr = 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5

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5
Q

how is copper unusual

A

copper prefers to have a full 3d subshell and and just one electron in the 4s subshell (gives it more stability)
Cu=1s2, 2s2, 2p6, 3s2, 3p6, 4s1. 3d10,

copper forms a stable Cu2+ ion by loosing 2 electrons.
the Cu2+ ion has an incomplete d subshell
Cu2+ = 1s2, 2s2, 2p6, 3s2, 3p6, 4s, 3d9

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6
Q

3d orbitals are occupied ______ at first only double up when they have to

A

singly

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7
Q

when ions are formed the _ electrons are removed first (then the d electrons)

A

s electrons

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8
Q

why arent scandium and zinc transition elements

A

cant form stable ions with incomplete d-subshells
Sc3+
Zn2+

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