C1 Atomic Structure Flashcards

1
Q

John Dalton’s discovery

A

(start of the 19th century) Atoms were first described as solid spheres

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2
Q

JJ Thomson’s discovery

A

(1897) Plum pudding model-the atom is a ball of charge with electrons scattered

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3
Q

Ernest Rutherford’s discovery

A

(1909) Alpha scattering experiment-mass concentrated at the centre; the nucleus is charged. Most of the mass is in the nucleus. Most atoms are empty space

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4
Q

Niels Bohr’s discovery

A

(1911) Electrons are in shells orbiting the nucleus

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5
Q

James Chadwick’s discovery

A

(1940) Discovered that there are neutrons in the nucleus

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6
Q

Isotopes

A

Atoms of the same element with different numbers of neutrons

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7
Q

What determines the way an element will react?

A

The number of electrons in the outermost shell of an element’s atoms

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