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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.
Who was the Greek Philosopher who believed in the Theory of the 4 Essences? Aristotle
Who was the scientist who opposed the Theory of 4 Essences, and came up with the idea of an "atom"? Democritus
What were Alchemists? Scientists of the Middle Ages Tried to change cheap metals into gold Tried to stop aging Tried to cure diseases
When two or more elements combine to form a new substance, what is this known as? A compound
What are some examples of common compounds Water salt sugar rust tarnish ammonia
Who was John Dalton? An English school teacher who proved Democritus was correct. He proposed his own Atomic Theory.
What is John Dalton known as? the "Father of the Modern Day Atomic Theory"
Who was Marie Curie? A Polish-born Scientist Worked most of her life with her husband, Pierre They studied radioactive elements
What were the two elements Marie Curie and Pierre discovered? Radium and Polonium
Who was Ernest Rutherford? A British physicist 1911 discovered that atoms are mainly empty space
What did Ernest Rutherford discover in 1918? The proton
Who was Niels Bohr? A scientist who initially believed that electrons flew around the nucleus in orbits
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.
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.
What is the atomic mass of an element equal to? The number of protons and neutrons in the nucleus of the atom.
What is atomic mass? The total number of nucleons in an atom.
How do you determine the number of neutrons in an atom's nucleus? Subtract the atomic number from the atomic mass
How many known elements are existing? 118
How many elements can be found in nature? 94
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
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
Created by: Sarahhh11