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What is thermometry?

Thermometry The branch of heat relating to the measurement of the temperature of a body is called thermometry. The thermometer is an instrument used to measure the temperature of a body. The essential requisites of a thermometer are given as under:  1) Construction, 2) Calibration, and 3) Sensitiveness. For the construction of a thermometer, the proper choice of a substance, whose physical property varies uniformly with rising in temperature, is essential. 1) Construction The physical property of a substance plays an important role in the construction of a thermometer. In a mercury thermometer, the principle of expansion of mercury with rising temperature is used. The platinum resistance thermometer is based on the principle of the change in resistance with a change in temperature. The gas thermometer is based on the principle of change in volume or pressure with a change in temperature. 2) Calibration  When a thermometer is constructed, it should be properly calibrated. The standa

Valency of Oxygen

What is the Valency of Oxygen?

The valency of oxygen is 2.

This means oxygen needs to gain or share two electrons for stability. To complete an octet requires 2 more electrons, hence the combining capacity or valency of oxygen is 2.

Electronic configuration of Oxygen

The capacity of bonding of an atom with another atom of an element while forming a molecule is called valency.

The valency of an element is determined by the number of atoms of H or Cl can be bond with one of its atoms.

Electronic configuration of Oxygen

For non-metal elements, the number of outermost odd electrons of an element is called valency.

From the electronic configuration of Oxygen, we can see there is two odd electrons of its outermost energy level.

So, the valency of oxygen is 2.

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