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Test (elaborations) General Chemistry
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Name : Angela Alyana Manalastas Date: 3/13/2022Teacher: Maricar Nituda Gonzales
Atomic Theories:
1. Dalton’s Atomic Theory
English chemist John Dalton subsequently made on the Greek notion of atoms in
1808. He postulated that matter is made of atoms, which are small indivisible
particles. He also proposed that while all atoms of one element are identical, they are
totally different from those that make up other elements.
Dalton’s atomic model:
A theory of chemical combination, first stated by John Dalton in 1803. It involves
the following postulates:
(1) Elements consist of indivisible small particles (atoms).
(2) All atoms of the same element are identical; different elements have different
types of atom.
(3) Atoms can neither be created nor destroyed.
(4) ‘Compound elements’ (i.e. compounds) are formed when atoms of different
elements join in simple ratios to form ‘compound atoms’ (i.e. molecules).Dalton also
proposed symbols for atoms of different elements (later replaced by the present
notation using letters).
(1) Elements consist of indivisible small particles (atoms).
(2) All atoms of the same element are identical; different elements have different
types of atom.
(3) Atoms can neither be created nor destroyed.
(4) ‘Compound elements’ (i.e. compounds) are formed when atoms of different
elements join in simple ratios to form ‘compound atoms’ (i.e. molecules).
2. Rutherford’s Hypothesis
-In 1911, Ernest Rutherford (British physicist) proposed a nuclear model on atoms.
An atom in which a nucleus exists. In the past, he discovered the part of activity such
as the movement of protons and electrons within the central part of the atom. He
further hypothesized that the number of protons and electrons are equals in an atom.
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