Chemistry Test - 7

There are 7 Periods in the Periodic Table.

Ernest Rutherford established that atoms have nuclei which are made up of Neutron and Proton, and electrons revolve around it.

Phosgene is the chemical compound with the formula COCl₂ .

A colorless gas, in low concentrations its odor resembles freshly cut hay or grass.

The maximum number of electrons on a principal shell is 2n².

According to Dalton's atomic theory the smallest particle which can exist independently is an atom. An atom is the smallest unit of matter that has the properties and forms a molecule. In the middle It is composed of a nucleus.

Producer gas is a fuel gas made from coke, anthracite and mainly constitutes carbon monoxide and nitrogen

Hard water is generally found in areas where groundwater is in contact with limestone, chalk and dolomite and gets higher amount of calcium and magnesium dissolved in it.

Sodium bicarbonate (IUPAC name: sodium hydrogen carbonate), commonly known as baking soda (especially in North America and New Zealand) or bicarbonate of soda, is a chemical compound with the formula NaHCO₃

Isotopes are atoms having same atomic number but different mass numbers. Examples Carbon with atomic number 6 occurs in three forms with mass numbers 12, 13 & 14.

Isobars are atoms having same mass number but different atomic numbers.

Isotones are atoms of different elements having same number of neutrons.

A positive helium ion.