Flashcards
Atoms and isotopes
Cards in this deck (12)
- 1What's the radius of an atom?Atoms are very small, having a radius of about 1 × 10^(-10) metres.
- 2What's the basic structure of an atom?The basic structure of an atom is a positively charged nucleus
composed of both protons and neutrons surrounded by negatively
charged electrons. - 3What's the radius of the nucleus of an atom?The radius of a nucleus is less than 1/10,000 of the radius of an atom.
Most of the mass of an atom is concentrated in the nucleus - 4How might the electron arrangements change with the absorption of electromagnetic radiation-Move further from the nucleus: a higher energy level
-Move closer to the nucleus: a lower energy level - 5What is the number of electrons equal to?In an atom the number of electrons is equal to the number of protons in
the nucleus - 6What does the number of protons in an element reflect?All atoms of a particular element have the same number of protons. The
number of protons in an atom of an element is called its atomic number. - 7What are atoms of the same element which have different numbers of neutrons called?Atoms of the same element can have different numbers of neutrons;
these atoms are called isotopes of that element. - 8What happens to an atom if it loses one or more outer electrons?Atoms turn into positive ions if they lose one or more outer electron(s).
- 9How was the plum pudding model developed?Before the discovery of the electron, atoms were thought to be tiny
spheres that could not be divided. The discovery of the electron led to the plum pudding model of the atom. The plum pudding model suggested that the atom is a ball of positive charge with negative electrons embedded in it - 10What was the scattering experiment?Conducted by Rutherford and his assistants Geiger and Marsden, abeam of alpha particles was aimed at very thin gold foil and their passage through the foil detected.
- 11What were the results of the scattering experiment?Some of the alpha particles emerged from the foil at different angles, and some even came straight back. The scientists realised that the positively charged alpha particles were being repelled and deflected by a tiny concentration of positive charge in the atom (nucleus).
- 12How did Niels Bohr adapt the nuclear model of the atom?Niels Bohr adapted the nuclear model by suggesting that electrons orbit
the nucleus at specific distances
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- GCSE Physics (P1 Atomic Structure) Flashcards on Atoms and isotopes, created by Amelia Quinn on 07/03/2018.
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- Amelia Quinn
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