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Chemistry OCR A Level > Topic 2.2.1 > Flashcards

Topic 2.2.1 Flashcards

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1
Q

What does the principle 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 principle quantum number

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3
Q

How many electrons can the first 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 3rd 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 religion around the nucleus that can hold up to 2 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 orbital
P orbital
D orbital
F orbital

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10
Q

What is the shape of an s orbital?

A

Spherical

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11
Q

What is the shape of a p orbital?

A

Dumb-bell shape

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12
Q

How many orbitals are found in an S sub shell?

A

1

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13
Q

How many electrons are found in an 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 subshell?

A

10

18
Q

How many orbitals are found in a f subshell?

A

7

19
Q

How many electrons can fill an f subshell?

A

14

20
Q

When using ‘electrons in box’ representation, what shape is used to represent the electrons?

A

Arrows

21
Q

What letter is used to represent shell number?

A

n

22
Q

From which shell onwards is s orbital present?

A

n= 1

23
Q

From which shell onwards is p orbital present?

A

n= 2

24
Q

From which shell onwards is d orbital present?

A

n= 3

25
Q

From which shell onwards is f orbital present?

A

n= 4

26
Q

What are the rules by which electrons are arranged in the shell? (5)

A
  • Electrons are added one at a time
  • Lowest available energy level is filled first
  • Each energy level must be filled before the next one can fill
  • Each orbital is filled singly before pairing
  • 4s is filled before 3d
27
Q

Why does the 4s orbital fill before the 3d orbital?

A

4s orbital has a lower energy than 3d before it’s filled

28
Q

What is the electron configuration of Krypton?

A

2 2 6 2 6 2 10 6

1s 2s 2p 3s 3p 4s 3d 4p

29
Q

Which electrons are lost when an atom becomes a positive ion?

A

Electrons in the highest energy levels

Chemistry OCR A Level (7 decks)

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