10 Questions
An atom is the smallest unit of matter.
True
_______________ discovered that the nucleus is the positively charged center of the atom.
Rutherford
What is an isotope?
An atom with the same number of protons but different number of neutrons
What is the sum of protons and neutrons in an atom called?
mass number
Match the following scientists with their contributions:
Dalton = Proposed the Atomic Theory Thomson = Discovered Electrons Rutherford = Discovered the nucleus Mendeleev = Published the first periodic table
Thomson's Model proposed that electrons move in orbits around the nucleus.
False
The average mass of all isotopes of an element is known as its _______________.
atomic mass
What are valence electrons?
Electrons in the outermost energy level
What are compounds?
Substances formed by the chemical combination of two or more different elements
A neutron is a particle in the nucleus with a positive charge.
False
Study Notes
Atomic Theory
- An atom is the smallest unit of matter.
Dalton's Atomic Theory
- Atoms of the same element have the same mass.
Thomson's Model
- Thomson's Model proposes that electrons move in orbits around the nucleus.
The Cloud Model
- The Cloud Model suggests that electrons do not move in fixed orbits around the nucleus.
Atomic Structure
- A neutron is a particle in the nucleus with no charge.
Atomic Discovery
- Ernest Rutherford discovered that the nucleus is the positively charged center of the atom.
- Niels Bohr suggested that electrons move in orbits around the atom's nucleus.
Atomic Terms
- The sum of protons and neutrons in an atom is called its mass number.
- Dmitri Mendeleev discovered and published the first periodic table.
- The average mass of all isotopes of an element is known as its atomic mass.
Isotopes
- An isotope is an atom with the same number of protons but a different number of neutrons.
Periodic Table
- Periods in the periodic table are rows.
- Valence electrons are electrons in the outermost energy level.
Physical Properties of Metals
- Metals have physical properties such as high luster, ductility, and malleability.
Compounds
- A compound is a substance formed with atoms of two or more elements together in fixed ratios.
Test your understanding of atomic theory with these true or false and fill-in-the-blank questions. Learn about Dalton's Atomic Theory, Thomson's Model, and the structure of atoms.
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