جميع المواضيع المتعلقة بـ ‘isotope’

 

simplified chemistry – atoms notes (cards)

ATOMS

THREE POSTULATES OF DALTON’S ATOMIC THEORY

1) An element is composed of identical atoms.

2) Atoms of different elements have different properties.

3) Compounds are atoms of 2 or more elements chemically combined.

THE LAW OF CONSERVATION OF MASS

During a physical change or reaction, or a chemical reaction, matter is neither created nor destroyed.

(Lavoisier – 1777)

THE LAW OF DEFINITE COMPOSITION

A compound always contains…

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Atoms

ATOMS

Law of constant composition: This states that “A chemical compound (if pure) always contains the same elements combined together in the same proportion by mass regardless of bow the compound is prepared or from where it is obtained”.

Law of conservation of mass: This is defined as “In every chemical reaction, the total mass of the products is the…

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isotopes and isobars

Isotopes: Isotopes are atoms of the same element having the same atomic number but different atomic masses. Note that the difference in the masses of isotopes is due to the different number of neutrons in their nuclei. Isotopes have the same chemical properties . because they have the same number of electrons. Isotopes have different physical properties because they have different number of neutrons.

Isobars: Nuclei of atoms of…

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