Which figure should replace the question mark (?) if the

Identify the element with the electronic configuration of 2, 8, 7.

What is the gas ‘Xenon’ also known as?

Which material is used as a moderator in a nuclear power plant that slows down the neutrons and makes them fit for causing fission?

Which chemical compound is commonly used in baking to provide more volume and a lighter texture to baked goods?

Which element is denoted by the atomic number 28?

Milk tastes sour when kept in the open for sometimes due to the formation of-

Petroleum is a mixture of-

Which of the following metal has the highest Melting point?

Calcium cyanamide, used as a fertilizer, is commercially known as ______.

What is the colour of base?