CH 1010 Chapter 3 Part 5

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ionization energy

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Chemistry

22 Terms

1

ionization energy

the energy required to remove an electron from the ground state in a neutral atom in the gas phase. (higher the Zeff, the higher the IE1) a negative and endothermic reaction

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2

endothermic

electron removal is a _____ process

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3

IE1

decreases moving down, increases moving right

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4

decreases, positive

whenever moving from 1A-3A to become isoelectric w 8A the radius _____ with a ____ charge

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5

increases, negative

whenever moving from 4A-7A to become isoelectric w 8A, the radius ___ and has a ____ charge

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6

lowest

Alkali metals have the ____ IE1

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7

highest

Noble Gases have the ___ IE1

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8

2 and 3

Periods _ and _ have differences in IE1

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9

Be/B, Mg/Al; N/O, P/S

Between what elements do these exceptions occur? Between 2A/3A, 5A/6A

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10

first core

There is a giant increase in ionization energy when comparing removing the last valence electron to removing the ___ ___ electron

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11

electron affinity

the energy released when a neutral atom in the gas phase gains an electron. positive and exothermic reaction. measure of the ability of an atom to accept an electron, more stable for more negative EA.

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12

endothermic

adding an electron is an ___ process

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13

negative, greater

The more ____ the EA, the _____ the electron affinity

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14

alkali earth metals/noble gases

For which columns is EA positive?

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15

H(g) = H+(g) + e-

IE is energy required to remove an electron, is it is positive and endothermic.

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16

H(g) + e- = H(g)

EA is the energy required to add an electron, it is negative and exothermic. (except for 2A and 8A)

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17

decreases

EA generally ___ going down a group (less negative)

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18

increases

EA generally _____ going left to right across a period (more negative)

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19

decreases

IE generally ____ going down a group (less positive)

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20

increases

IE generally _____ going across a row (more positive)

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21

IE, EA, Zeff

decreases going down, increases going across

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22

radius

increases going down, decreases going across

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