Module 3- group 2 metals

Question 1

Electron configurations of first 5 metals ( noble gas shortcut)

Answer 1

Be=[He]2s2
Mg= [Ne]3s2
Ca=[Ar]4s2

Question 2

Where are all the outer electrons of group 2 metals found

Answer 2

In the S orbital

Question 3

How does atomic radius change as you go down the group??

Answer 3

Increases due to more shells of electrons and more shielding, reducing attraction between nucleus and outer electrons

Question 4

How does 1st I.E change as you go down group??

Answer 4

Decreases- more shielding and bigger AR makes outer electron easier to lose, outweighs increases atomic attraction to electrons

Question 5

How does electronegativity change down the group??

Answer 5

Decreases- successive elements worse at attracting pair of electrons

Question 6

General equation for group 2 metals and oxygen? (m=metal)

Answer 6

2M+ O2-> 2MO
EG
2Mg+O2->2MgO

Question 7

General equation for metal + water

Answer 7

M+H2O->M(OH)2 +H2
EG
Mg+H20->Mg(OH)2 +H2

Question 8

Why is the reaction of a group 2 metal and water a redox reaction??

Answer 8

The metal eg Mg is oxidised, whilst the Hydrogen is reduced to form H2

Question 9

Why does rate of reaction increase down the group??

Answer 9

Lower ionisation energy, easier for outer electrons to form/ ions to form

Question 10

Group 2 metal oxide plus water reaction (MgO)

Answer 10

MgO+H2O-> Mg(OH)2

Question 11

How does solubility of metal oxides/hydroxides change down the group??

Answer 11

Get more soluble down the group, and more alkaline, because more OH- ions released more easily

Question 12

Reaction of group 2 metals and acid

Answer 12

ALWAYS MAKES A SALT AND HYDROGEN
eg Mg(OH)2 (milk of magnesia) neutralises HCl in your stomach
2HCl+Mg(OH)2->MgCl2+2H20