Quiz 1 Study Flashcards
Study Quiz 1
What did Democritus Do?
Proposed all matter is made up of small, indivisible particles called atoms.
What did John Dalton do?
Proposed the Atomic Theory, providing a foundation for modern science.
What did Rutherford do?
Conducted the Gold Foil Experiment, discovering the dense nucleus of atoms.
What did Neils Bohr do?
He developed the planetary model of atoms with electrons orbiting the nucleus.
What did Schrodinger do?
Introduced the electron cloud model and quantum mechanics.
When did Democritus propose his theory?
5th Century B.C
When did Dalton propose his theory?
1803
When did Rutherford Propose his theory?
1911
When did Bohr Propose his theory?
1913
When did Schrodinger propose his theory?
1926
What are Protons?
Positively charged, located in the nucleus.
What are Neutrons?
Neutral particles, are located in the nucleus.
What are Electrons?
Negatively charged, orbit the nucleus in energy levels.
What are Valance Electrons?
Electrons in the outermost energy level, crucial for chemical bonding.
What are groups?
Columns that indicate the number of valance electrons
What are periods?
Rows that indicate the number of energy levels.
What is the Periodic law?
Elements are arranged in order of increasing atomic number.
What are some key properties?
Metals (left side of the periodic table), nonmetals (right side of the Periodic table), & noble gasses (group 8)
What is the Atomic Number (Z)?
Number of protons in the Nuculus.
What is the Atomic mass (A)?
The sum of protons and neutrons in the nucleus.
What are Isotopes?
Variants of elements differing in the neutron count.
What is the Law of Periodicity?
Elements are arranged in order of increasing atomic number.
