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A proton donor.

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Viscosity

Resistance offered by the molecules of a liquid to flow is termed as viscosity.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Barometer

A device for measuring pressure.

Yellowcake

The solid form of mixed uranium oxide, which is produced from uranium ore in the uranium recovery (milling) process.

Bronsted-Lowry Acid

A proton donor.

First Law of Thermodynamics

The total amount of energy in the universe is constant (also known as the Law of Conservation of Energy) energy is neither created nor destroyed in ordinary chemical reactions and physical changes.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.

Coordinate Covalent Bond

A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.

Halogens

Group VIIA elements: F, Cl, Br, I

Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.