Periodictable - Questions

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Slide 41

Where do you get the numerical value for the n for the valence electrons?

You find the _ number!!!

Can you use this information to make electron configuration easier?

Slide 42

Valence electron configuration for:

P

Bi

Sr

Te

I

Cs

Slide 43

The octet rule

It has been noted that extra stability occurs when an atom or ion has 8 electrons in the outermost energy level (2 or 0 for the first period).

Slide 44

Group IA ns1

Lose

Group IIA ns2

Loses

Group IIIA ns2np1

Loses

Group IVA ns2np2

Group VA ns2np3

Gains

Group VIA ns2np4

Gains

Group VIIA ns2np5

Gains

Group VIIIA ns2np6

Slide 45

Group IA

Group IIA

Group IIIA

Group VA

Group VIA

Groupr VIIA

Names of ions: for cations--name of element plus ion

For anions: replace the last syllables of the element name by --ide + ion.

Slide 46

Transition metal cations

No simple rules as for A groups

Cu+, Cu2+

Fe2+, Fe3+

Au+, Au3+

Slide 47

H-

H+

Li+

Be2+

B3+

N3-

O2-

F-

Slide 48

What’s the ion formed by

P

Ba

S

N

I

Cs

Slide 49

Slide 50

Isoelectronic

Atoms or ions

F- [He] 2s2 2p6

O2- [He] 2s2 2p6

Name a cation isoelectronic with O2-

Slide 51

Question 3.12

Which of the following pairs of atoms and ions are isoelectronic?

Cl-, Ar

Na+, Ne

Mg2+, Na+

Li+, Ne

O2-, F-

Slide 52

Which of the following groups are isoelectronic with each other?

Na+, Mg2+, Ne

Cl-, F-, Ar

Na+, Mg2+, Al3+, N3-, O2-, F-, Ne

Slide 53

Trends in the periodic table

Think of atom as sphere whose radius is determined by the location of the e’s furthest from the nucleus.