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Physical Sci Chapt 4

Atomic Structure

QuestionAnswer
Who discovered the nucleus? Rutherford
What is Dalton's theory? All elements are composed of atoms. All atoms of the same element have the same mass, atoms of diff elements... and Compounds contain atoms of more than one element. In a particular compound, atoms of different elements always combine in the same way.
What did Bohr introduce to atomic theory with his model? electrons moving in orbits about the nucleus
Which of the following is ALWAYS true regarding atoms of two different elements? They have different numbers of protons.
J. J. Thomson's experiments provided the first evidence of subatomic particles
Calcium's atomic number is 20. What does that that tell us about a calcium atom? It has 20 protons
In which way do isotopes of an element differ? number of neutrons in the atom
The subatomic particle(s) found in the nucleus of an atom are protons and neutrons.
What is the maximum number of electrons that can occupy an atomic orbital? 2
What is meant when an atom is said to be in its ground state? The atom's electrons all have the lowest possible energies.
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