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Questions and Answers
What is the main factor that distinguishes one chemical element from another?
What is the main factor that distinguishes one chemical element from another?
- Number of protons in their atoms (correct)
- Number of electrons in their atoms
- Size of their atoms
- Number of neutrons in their atoms
What are isotopes of the same element defined by?
What are isotopes of the same element defined by?
- Same number of protons but different number of neutrons (correct)
- Same number of electrons but different number of protons
- Same number of protons and neutrons
- Same number of neutrons but different number of protons
What causes electrons to be bound to the nucleus in an atom?
What causes electrons to be bound to the nucleus in an atom?
- Electromagnetic repulsion
- Opposing charge between electrons and nucleus (correct)
- Strong nuclear force
- Gravitational force
What happens when an atom has more electrons than protons?
What happens when an atom has more electrons than protons?
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Why is it not possible to see atoms with conventional microscopes?
Why is it not possible to see atoms with conventional microscopes?
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Study Notes
Chemical Elements
- The main factor that distinguishes one chemical element from another is the number of protons in the atomic nucleus.
Isotopes
- Isotopes of the same element are defined by having the same number of protons (atomic number) but differing numbers of neutrons.
Atomic Structure
- Electrons are bound to the nucleus in an atom due to the attraction between the positively charged protons and negatively charged electrons.
Ions
- When an atom has more electrons than protons, it becomes a negatively charged ion, known as an anion.
Atomic Visibility
- It is not possible to see atoms with conventional microscopes because atoms are extremely small, with diameters in the range of 1 to 3 angstroms (Å).
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