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At tabular arrangement of elements according to their atomic numbers.
Fuels formed by nautral resources such as buried bodies.
Subatomic particle with a positive electric charge.
Elementary particle with a neutral charge and a mass almost equal to a proton.
A heavy odourless gas formed during repiration of humans and animals or when things are burned.
Warming that happens when solar radiation is trapped by the atmosphere.
Something that can be renews or extended
A colourless gas (O3) which occurs in the stratosphere, 20 to 30km above the Earth's surface.
Electromagnetic radiation with a wacelength shorter than visible light.
A disease in which harmful growths form in the body.
A pure chemical substance consisting of one type of atom distinguished by its atomic number
Consists of two protons and two neutrons bound togther into a particle identical to a helium nucleus
High-energy, high-speed electrons or protons emitted by certain types of radioactive nuclei.
Electromagnetic radiation emmitted during radio-active decay and has an extremely short wavelength.
A nuclear reaction where a nucleus splits.
A nuclear reaction where nuclei combines to form a bigger nuclei
The time required for half of the atoms in any given quantity of a radioactive isotope to decay into another element.
An element produced either naturally or artifically.