Atomic Number
The atomic number of an element is the number of protons found in the nucleus of an atom. It is a unique identifier for each element and is used to organize the elements on the periodic table. The atomic number determines the chemical properties of an element and distinguishes it from other elements.
Study Guide
- Definition: The atomic number is the number of protons in the nucleus of an atom.
- Location on the Periodic Table: The atomic number is located above the symbol of each element on the periodic table.
- Unique Identifier: Each element has a distinct atomic number, which is used to identify and organize the elements.
- Relationship to Chemical Properties: The atomic number determines the chemical properties of an element and its behavior in chemical reactions.
- Connection to Isotopes: Isotopes of an element have the same atomic number but different mass numbers due to a different number of neutrons.
- Atomic Number and Electron Configuration: The atomic number also determines the number of electrons in a neutral atom when it is not an ion.
Understanding the concept of atomic number is crucial for comprehending the organization of the periodic table and the behavior of elements in chemical reactions.
.◂Science Worksheets and Study Guides Third Grade. Relationships among living things
Study Guide
Relationships among living things 
Activity Lesson
Relationships Among Living Things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things
Activity LessonWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
LIFE SCIENCE
From Molecules to Organisms: Structures and Processes
Create representations to explain the unique and diverse life cycles of organisms other than humans (e.g., flowering plants, frogs, butterflies), including commonalities such as birth, growth, reproduction, and death.
Unity and Diversity
Construct an argument from evidence to explain the likelihood of an organism’s ability to survive when compared to the resources in a certain habitat (e.g., freshwater organisms survive well, less well, or not at all in saltwater; desert organisms survive well, less well, or not at all in woodlands).
Create models that illustrate how organisms and their habitats make up a system in which the parts depend on each other.