Atomic Structure & Scientists
Flashcard
•
Science
•
10th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What did Rutherford discover about the atom?
Back
Rutherford found that the atom is mostly empty space.
2.
FLASHCARD QUESTION
Front
What is the identity of the element with isotopes having masses of 75.23 amu (24.1%), 74.61 amu (48.7%), and 75.20 amu (27.2%)?
Back
The identity of the element is Arsenic (As).
3.
FLASHCARD QUESTION
Front
Who was the Greek philosopher that introduced the concept of 'atomos'?
Back
Democritus introduced the concept of 'atomos'.
4.
FLASHCARD QUESTION
Front
What element is represented by the atomic model shown?
Back
The element is Sodium (Na).
5.
FLASHCARD QUESTION
Front
Calculate the average mass of an element with isotopes having masses of 75.23 amu (24.1%), 74.61 amu (48.7%), and 75.20 amu (27.2%).
Back
The average mass is 74.92 amu.
6.
FLASHCARD QUESTION
Front
What is the main contribution of John Dalton to atomic theory?
Back
John Dalton proposed that all matter is made of atoms, which are indivisible and indestructible.
7.
FLASHCARD QUESTION
Front
What did J.J. Thomson discover about the atom?
Back
J.J. Thomson discovered the electron and proposed the 'plum pudding' model of the atom.
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