Atomic Structure
ICSE · Class 7 · Chemistry
Flashcards for Atomic Structure — ICSE Class 7 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setWhat is an atom?
Answer
An atom is the smallest particle of an element that exhibits all the properties of that element. It may or may not exist independently, but it takes part in chemical reactions.
Why is the word atom linked with Democritus?
Answer
The word atom comes from atomos, meaning indivisible. Democritus coined this idea and said the universe was made of tiny indivisible particles called atoms.
Who suggested in 1808 that the atom is the basic unit of matter?
Answer
John Dalton suggested in 1808 that the atom is the basic unit of matter.
What are the main characteristics of atoms?
Answer
Atoms of the same element are identical but differ from atoms of other elements. Atoms cannot be created or destroyed. They may or may not exist independently, but they take part in chemical reactions…
What are the three fundamental particles in an atom?
Answer
The three fundamental particles are electrons, protons, and neutrons.
What is an electron?
Answer
Electrons are the negatively charged particles in an atom with one unit negative charge and negligible mass. The mass of an electron is 1/1837 times the mass of one hydrogen atom. Electrons are found …
What is a proton?
Answer
Protons are the positively charged particles present in an atom with one unit positive charge and one unit mass. They are located in the nucleus.
What is a neutron?
Answer
Neutrons are the particles with no electrical charge, so they are neutral but have one unit mass. They are located in the nucleus.
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