Chapter 2- The Periodic Table Flashcards Preview

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Flashcards in Chapter 2- The Periodic Table Deck (29):
1

Who is the most credited person for the periodic table?

Dmitri Mendelev

2

Did he arrange ALL elements?

No he left gaps for others to be discvoered.

3

How is the periodic table arranged?

In order of increasing atomic mass

4

How many periods are in the periodic table?

7

5

What will the period correspond to?

How many shells that element has

6

Vertical colums are....

Groups

7

What do the groups correspond to?

The number of electrons in the last shell.

8

How many blocks are in the periodic table?

4

9

What is block s

groups 1&2

10

What is block p

groups 13-18

11

What is block d

groups 3-12

12

What is block f

"inner transition elements"

13

Summarise trends in the periodic table for atomic size

Increase down a group and decrease across as period

14

Why does the atomic size increase down a group?

Electrons are added to higher energy levels, they move further away from the nucleus

15

Why does the atomic radius decrease across a period?

Each element has an extra proton and electron than the previous element. therefore the attraction force increase and pulls the electrons closer towards the nucleus.

16

Define Ionisation Energy

The energy required to remove an electron from a single atom

17

Summarise trends in the periodic table for ionisation energy

Decreases down a group and increases across a period

18

Why does the ionisation energy decrease down a group?

Atomic size is increasing and electrons are moving furhtue away from the nucleus therefore more easily removed

19

Why does the ionisation energy increase across a period?

Electrons have a higher attraction for the nucleus and have a stronger connection, therefore harder to remove.

20

Define electronegativity

Degree in which an atom can attract an electron to itself.

21

What are the lease electronegative?

Francium and Caesium (0.7)

22

What are the most electronegative?

Fluorine (4.0)

23

Summarise trends in the periodic table for electronegativity

-Across a period from left to right it increases
-Down a group the electronegativity decrease

24

What is metalliac characteristics in regards to the periodic table?

-Are determined by how easy it is to loose one of its electrons

25

Summarise trends in the periodic table for metalliac character

-Decrease across a period
-Increase down a group

26

Define Oxidising Strength

How readily an element gains electrons.

27

Define Reducing Strength

How readily an element looses electrons

28

Summarise trends for reactivity

Metals
Across a period decreases
-Down a group increases
Non-Metals
Across a period increases
Down a group decreases

29

Are cations or anoins smaller?

Cations