PS.2 Atomic Theory

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What is Dalton's atomic theory?

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Dalton's atomic theory states that all matter is made up of atoms, which are indivisible and indestructible particles. Atoms of the same element are identical in mass and properties, while atoms of different elements differ in mass and properties.

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Who proposed the first atomic theory?

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John Dalton, a British school teacher, is credited with proposing the first atomic theory.

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What did J.J. Thomson discover about the atom?

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J.J. Thomson discovered that the atom is not a solid sphere but consists of a positively charged sphere with negatively charged electrons embedded within it, leading to the 'plum pudding' model.

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What model of the atom did John Dalton propose?

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John Dalton proposed that atoms are tiny, indivisible solid spheres, similar to balls or marbles.

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What did John Dalton explain about the mass of atoms?

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John Dalton explained that atoms are too small to see and that atoms of different elements have different masses.

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What is the significance of the atomic theory in chemistry?

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The atomic theory provides a framework for understanding the composition of matter, chemical reactions, and the behavior of elements and compounds.

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What is the difference between an atom and a molecule?

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An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

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What did Ernest Rutherford discover about the atom?

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Ernest Rutherford discovered that atoms have a small, dense nucleus that contains positively charged protons, with electrons orbiting around it.

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What is the role of electrons in an atom?

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Electrons are negatively charged particles that orbit the nucleus of an atom and are involved in chemical bonding and reactions.

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What is the nucleus of an atom?

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The nucleus is the central part of an atom, containing protons and neutrons, and is responsible for most of the atom's mass.