Periodicity

Question 1

Why can Hydrogen be placed in Group 1 (Alkali Metals) and group 7 (Halogens)

Answer 1

Hydrogen can be placed in Group 1 because it forms positive ions like Alkali Metals and it can also be placed in Group 7 because it forms negative ions like Halogens do. However it should be placed in Group 1 as it has one valence electron

Question 2

Groups of elements in the periodic table?

Answer 2

Group 1 - Alkali Metals
Group 2 - Alkaline Earth Metals
Transition Elements  
Semi Metal / Metalloids 
Non-metals
Group 7 - Halogens 
Group 0 - Noble Gases

Question 3

What elements make up the Halogens?

Answer 3

F -Fluorine
Cl - Chlorine
Br - Bromine
I - Iodine
At - Astatine 
Ts - Tennessine

Question 4

What elements make up the Alkali Metals?

Answer 4

Lithium (Li)
Sodium (Na)
Potassium (K)
Rubidium (Rb)
Cesium (Cs)
Francium (Fr)