Hydracids and hydroxides

Which of these options are Hallogens?

• Chlorine (Cl)

  Bromine (Br)

• Hydrogen (H)

  Berillium (Be)

• Neon (Ne)

  Argon (Ar)

• Copper (Cu)

  Sodium (Na)

Which of these elements are Chalcogens (Group 6A)?

• Chlorine (Cl)

  Bromine (Br)

• Sulphur (S)

  Selenium (Se)

• Hydrogen (H)

  Lithium (Li)

• Neon (Ne)

  Argon (Ar)

The oxidation number of Group 1A (Li, Na, K...)

• -5

• +1

• +7

• +2

Oxidation number of Group 2A elements (Be, Mg, Ca...)

• +2

• -1

• +54

• -2

Hydrogen bromide

 Hydrogen chloride

 Hydrobromic acid

 H2S

HCl(aq)

 HF