Atomic Structure — Class 9 (Medium)
Eight multiple-choice questions on atomic structure for class 9 science focusing on core concepts, applications, and common misconceptions.
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Quiz Questions & Answers
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Question 1: What defines the identity of an element in an atom?
Total number of neutrons
Number of electrons in any atom
Total number of nucleons (protons and neutrons)
Number of protons in the nucleus
Question 2: Which statement best describes a neutral atom?
It has equal numbers of protons and electrons
Protons and neutrons have opposite charges
It always has twice as many electrons as protons
It has no neutrons in the nucleus
Question 3: If an atom loses one electron, what does it become?
A positively charged ion (cation)
A neutral atom with extra energy
A negatively charged ion (anion)
An isotope of the same element
Question 4: Which model first described electrons orbiting the nucleus in fixed energy levels?
Thomson's plum pudding model
Bohr model
Dalton's solid sphere model
Schrödinger wave model
Question 5: Why do isotopes of an element have nearly identical chemical behavior?
They have identical masses
They have identical numbers of neutrons
They have the same number of electrons and protons
They have equal nuclear binding energy
Question 6: Which observation would best disprove the idea that electrons are stationary inside atoms?
Spectral lines showing discrete energy transitions
Protons changing into electrons
Atoms showing variable mass numbers
Objects emitting heat when compressed
Question 7: A neutral sodium atom has 11 protons. Which electron arrangement most likely describes its outermost shell?
Two electrons in the outermost shell
Eight electrons in the outermost shell
One electron in the outermost shell
Eleven electrons in the outermost shell
Question 8: Which statement corrects the myth: 'Neutrons determine an element's chemical reactions'?
Neutrons become electrons during reactions
Chemical reactions are governed mainly by electrons and their arrangements
Neutrons carry negative charge influencing bonds
Neutrons define the atomic number and chemical type