Theory
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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What is the Theory of the 4 Essences? | All forms of matter were a combination of earth, air, fire, and water.
Many Greeks believed this.
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Who was the Greek Philosopher who believed in the Theory of the 4 Essences? | Aristotle
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Who was the scientist who opposed the Theory of 4 Essences, and came up with the idea of an "atom"? | Democritus
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What were Alchemists? | Scientists of the Middle Ages
Tried to change cheap metals into gold
Tried to stop aging
Tried to cure diseases
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When two or more elements combine to form a new substance, what is this known as? | A compound
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What are some examples of common compounds | Water
salt
sugar
rust
tarnish
ammonia
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Who was John Dalton? | An English school teacher who proved Democritus was correct.
He proposed his own Atomic Theory.
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What is John Dalton known as? | the "Father of the Modern Day Atomic Theory"
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Who was Marie Curie? | A Polish-born Scientist
Worked most of her life with her husband, Pierre
They studied radioactive elements
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What were the two elements Marie Curie and Pierre discovered? | Radium and Polonium
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Who was Ernest Rutherford? | A British physicist
1911 discovered that atoms are mainly empty space
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What did Ernest Rutherford discover in 1918? | The proton
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Who was Niels Bohr? | A scientist who initially believed that electrons flew around the nucleus in orbits
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What was Niels Bohr's changed idea? | Electrons were forced on shells (orbitals) outside of the nucleus.
He believed electrons could "jump" from one shell to another.
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What is an element's atomic number? | The number of protons and neutrons in the nucleus of the atom.
The atomic mass is the total number of nucleons in an atom.
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What is the atomic mass of an element equal to? | The number of protons and neutrons in the nucleus of the atom.
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What is atomic mass? | The total number of nucleons in an atom.
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How do you determine the number of neutrons in an atom's nucleus? | Subtract the atomic number from the atomic mass
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How many known elements are existing? | 118
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How many elements can be found in nature? | 94
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Why can the number of protons and electrons in an element be the same? | Since protons have a positive charge and the electrons have a negative charge, the overall charge of an atom is normally neutral
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What does Fermium have an atomic number of? Mass? How many neutrons are in the nucleus of an atom of fermium | Atomic number- 100
Mass- 257
Neutrons- 157
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Created by:
Sarahhh11
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