Atomic Structure
Grade 8 · Science · Chemistry · Missouri, USA
Lesson Summary
Learn what atoms are made of and how their parts are arranged.
Explanation
An atom is the smallest unit of an element that still has that element's properties. Every atom has a nucleus at its center containing protons (positive charge) and neutrons (no charge). Electrons (negative charge) orbit the nucleus in energy levels called shells. The number of protons defines which element the atom is—for example, every carbon atom has exactly 6 protons. Understanding atomic structure is the foundation of all chemistry.
Practice Questions
Q1: What are the three subatomic particles in an atom?
Answer: Protons (positive charge in the nucleus), neutrons (no charge in the nucleus), and electrons (negative charge orbiting the nucleus).
Q2: An atom has 8 protons. What element is it?
Answer: Oxygen, because the number of protons (atomic number) determines the element, and oxygen has 8 protons.
Q3: What keeps electrons orbiting the nucleus?
Answer: The electromagnetic force—the attraction between the negatively charged electrons and the positively charged protons in the nucleus.
People Also Ask
What is Atomic Structure in Grade 8 Science?+
Atomic Structure is a lesson in the Chemistry chapter of Grade 8 Science. It is part of the Missouri, USA school curriculum and covers key concepts that students need to understand at this level.
What grade level covers Atomic Structure?+
Atomic Structure is taught in Grade 8 as part of the Science curriculum in Missouri, USA.
How can I help my child with Chemistry in Science?+
Start with the lesson summary and explanation on this page. Practice the questions provided, then use TutorTom for personalized, step-by-step help with Chemistry topics.