BEE3B-Practicum-Periodic Elements

Brass gets discoloured in air because of the presence of which of the following gases in air?

• Oxygen

• Hydrogen sulphide

• Carbon dioxide

• Nitrogen

Which of the following is a non metal that remains liquid at room temperature?

• Phosporus

• bromine

• chlorine

• Helium

Chlorophyll is a naturally occurring chelate compound in which central metal is

• Copper

• Magnesium

• Iron

• Calcium

Which of the following is used in pencils?

• Graphite

• Silicon

• Charcoal

• Phosphorous

Which of the following metals forms an amalgam with other metals?

• Tin

• Mercury

• Lead

• Zinc

Magnesium, Calcium , Iron and Aluminum are examples of what group

Chlorine, Oxygen , Bromine and lodine are examples of what group f elements.

Where can you find the noble gases in the periodic table ?

What do you call to the group of elements that forms diagonal staircase in the periodic table, which separate metls and non metals.

How many valence electrons of all Noble gases.​