Electron structure Flashcards

1
Q

What does the principal quantum number indicate

A

The shell occupied by the electrons

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2
Q

What is a shell

A

A group of orbitals with the same principal quantum number

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3
Q

How many electrons can the 1st shell hold

A

2

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4
Q

How many electrons can the second shell hold

A

8

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5
Q

How many electrons can the third shell hold

A

18

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6
Q

How many electrons can the 4th shell hold

A

32

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7
Q

What is an orbital

A

A region around the nucleus that can hold up two electrons with opposite spins

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8
Q

How many electrons can an orbital hold

A

2

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9
Q

What are the 4 types of orbitals

A

s
p
d
f

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10
Q

What is the shape of a s-orbital

A

Spherical

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11
Q

What is the shape of a p-orbital

A

Dum-bell shape

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12
Q

How many orbitals are found in a S subshell

A

1

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13
Q

How many electrons can be held in a S subshell

A

2

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14
Q

How many orbitals does a P subshell have

A

3

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15
Q

How many electrons can be held in a P subshell

A

6

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16
Q

How many orbitals are present in a D subshell

A

5

17
Q

How many electrons can be held in a d-sub shell

A

10

18
Q

What are the rules by which electrons are arranged in shells

A

1)Electrons are added at one time
2) Lowest available energy level is filled first
3) Each energy level must be filled before the next one can fill
4) Each orbital is filled singly before paring
5) 4s is filled before 3d

19
Q

Why does 4s orbital fill before 3d

A

$s orbital has lower energy that 3d before its filled

20
Q

Which electrons are lost when an atom becomes a positive ion

A

Electrons in the highest energy levels