Atomic Structure
ICSE · Class 7 · Chemistry
Summary of Atomic Structure for ICSE Class 7 Chemistry. Key concepts, important points, and chapter overview.
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Atomic structure explains that matter is made of tiny particles called atoms. Atoms join to form molecules, and charged particles called radicals help form compounds. The chapter also shows how valency helps in writing chemical formulae and how the periodic table is connected with the combining capa
Key Concepts
An atom is the smallest particle
An atom is the smallest particle of an element that exhibits all the properties of that element. Atoms may or may not exist independently, but they ta
An atom contains electrons
An atom contains electrons, protons, and neutrons. Electrons are negatively charged and are found in orbits or shells outside the nucleus. Protons are
The number of protons in
The number of protons in the nucleus is called the atomic number. The sum of protons and neutrons in the nucleus is called the mass number. In a neutr
A molecule is the smallest particle
A molecule is the smallest particle of a pure substance that has independent existence. Molecules are formed when two or more atoms combine chemically
Atomicity is the number of atoms
Atomicity is the number of atoms present in one molecule of an element. Helium is monatomic, hydrogen is diatomic, ozone is triatomic, and phosphorus
Learning Objectives
- Define atom, molecule, radical, and valency
- Describe the basic particles inside an atom
- Explain atomic number and mass number
- Classify molecules as monatomic, diatomic, triatomic, and polyatomic
- Understand radicals as positive or negative charged particles
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