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 arrange the elements in the periodic table. The atomic number determines the chemical properties of an element and distinguishes one element from another.
Study Guide for Atomic Number:
- Definition: The atomic number is the number of protons in the nucleus of an atom.
- Location in periodic table: The atomic number is typically found above the chemical symbol of an element in the periodic table.
- Unique to each element: No two elements have the same atomic number.
- Chemical properties: The atomic number determines the element's position in the periodic table and its chemical properties.
- Relationship to the number of electrons: In a neutral atom, the number of protons (atomic number) is equal to the number of electrons surrounding the nucleus.
◂Science Worksheets and Study Guides First Grade. Earth's resources
Study Guide
Earth's resources 
Worksheet/Answer key
Earth's resources Worksheet/Answer key
Earth's resources Worksheet/Answer key
Earth's resources Vocabulary/Answer key
Earth's resources Vocabulary/Answer key
Earth's resources
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
EARTH AND SPACE SCIENCE (NGSS)
Earth’s Place in the Universe
Students who demonstrate understanding can:
Use observations of the sun, moon, and stars to describe patterns that can be predicted.
Make observations at different times of year to relate the amount of daylight to the time of year.