3.1.1 Flashcards

atomic structure

1
Q

what is the relative mass of an electron?

A

1/1840

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2
Q

what force holds together protons and neutrons/
hint- where are they located?

A

nuclear force

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3
Q

what’s the definition for relative atomic mass and relative molecular mass?

A

the mass of a single Atom (Ar)/ molecule (Mr) relative to 1/12 of a carbon atom

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4
Q

what’s the equation for the relative atomic mas of isotopes?

A

Ar=(mass of isotope 1 * %abundance) + (mass of isotope2 * %abundance)

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5
Q

what is the maximum number of electrons per orbital?

A

2

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6
Q

what is the Aufbau principle?

A

electrons always fill up the lowest energy levels first

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7
Q

which orbital has six electrons?

A

P orbital

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8
Q

what is Hund’s rule?

A

electrons would rather have their own orbitals before pairing up.

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9
Q

what is the electron configuration for an element with 9 electrons

A

1s2 2s2 2p5

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10
Q

how many total electrons in the D orbital?

A

10

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11
Q

many electrons in the S orbital?

A

2

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12
Q

in time of flight calculations, what is he equation for Kinetic energy?

A

Ek = 1/2 * m * v^2

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13
Q

what three factors effect ionisation energy?

A

radius
electron shielding
nuclear charge

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14
Q

does ionisation energy increase or decrease across a period?

A

increase

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15
Q

in time of flight calculations, what is the equation for velocity?

A

v= d/t

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16
Q

what is the value of Avogadro’s constant (1 mole)

A

6.022* 10^23

17
Q

does ionisation energy increase or decrease down group?

A

decrease

18
Q

what is he definition of ionisation energy?

A

the amount of energy required for one mole of an element/compound to lose 1 mole of electrons.

19
Q

describe electron impact ionisation?

A

an electrons are fired at the sample, this nocks off one of the samples electrons from orbit creating a positive ion -because one electron is lost.

20
Q

in time of flight mass spectroscopy, what is used to accelerate the ions?

A

an electric field

21
Q

what is the detector in time of flight mass spectroscopy?

A

a negatively charged plate

22
Q

how does electrospray ionisation occur?

A

the sample is dissolved in solvent and then fired through a positively charged hypodermic needle, the solvent evaporates and the sample gains a proton creating a positive ion.

23
Q

after acceleration, the ions all have the same what?

A

kinetic energy

24
Q

what does time of flight mass spectroscopy find?

A

the mass and percentage abundance of ions

25
Q

what are the four stages of time of flight mass spectroscopy?

A

ionisation
acceleration
ion drift
detection

26
Q

what are the two types of ionisation in time of flight mass spectroscopy

A

electrospray ionisation
electron impact ionisation

27
Q

is nuclear force strong or weak

A

strong

28
Q

what technique is used to find the relative mass of elements and compounds?

A

time of flight mass spectroscopy

29
Q

what force holds electrons to protons?

A

electrostatic force