Periodic table trends

Question 1

Atomic radius across periods

Answer 1

Decreases

Question 2

Atomic radius down groups

Answer 2

Increases

Question 3

Atomic radius across periods WHY

Answer 3

Increasing Zeff

Question 4

Atomic radius down groups WHY

Answer 4

More energy levels

Question 5

Cations vs. neutral atom WHY

Answer 5

Removes energy level

Question 6

Cations vs. neutral atom

Answer 6

Smaller

Question 7

Anions vs. neutral atom

Answer 7

Bigger

Question 8

Anions vs. neutral atom WHY

Answer 8

More electrons than protons, electrons held loosely

Question 9

First ionization energy

Answer 9

Energy required to remove 1 mole of electrons from 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions

Question 10

First ionization energy across periods

Answer 10

Increases

Question 11

First ionization energy across periods WHY

Answer 11

Increasing Zeff

Question 12

First ionization energy down groups

Answer 12

Decreases

Question 13

First ionization energy down groups WHY

Answer 13

More electron levels therefore larger radius

Question 14

Electronegativity

Answer 14

Ability of an atom to attract (a pair of) electrons in a covalent bond

Question 15

Electronegativity across periods

Answer 15

Increases to group 17

Question 16

Electronegativity across periods WHY

Answer 16

Increasing Zeff

Question 17

Electronegativity down groups

Answer 17

Decrease

Question 18

Electronegativity down groups WHY

Answer 18

More electron levels therefore larger radius

Question 19

First electron affinity

Answer 19

Energy released when one mole of electrons are added to one mole of gaseous atoms to form one mole of gaseous 1− ions

Question 20

First electron affinity across periods

Answer 20

Increases to group 17

Question 21

First electron affinity across periods WHY

Answer 21

Moving towards full outer valence shell, more energy gets released as move across period. When energy is released, the ion moves to a lower energy state.

Question 22

Melting point down group 1

Answer 22

Decrease

Question 23

Melting point down group 17

Answer 23

Increase

Question 24

Melting point across periods

Answer 24

Increase across a period until group 14, then decrease