Structure of the Atom
Rajasthan Board · Class 9 · Science
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Who discovered the electron?
What is the charge on a proton?
According to Thomson's model, atoms are like:
The maximum number of electrons in the K shell is:
Sample Questions
Which subatomic particles are present in the nucleus of an atom?
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Protons, Neutrons
The nucleus contains protons (positively charged) and neutrons (neutral). Electrons revolve around the nucleus in shells. Positrons are not found in normal atoms.
What did Rutherford's gold foil experiment prove?
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Most of the atom is empty space, The nucleus is very small, All positive charge is concentrated in the nucleus
Rutherford's experiment showed that most alpha particles passed through (empty space), few were deflected (small nucleus), and very few bounced back (concentrated positive charge). This disproved Thomson's model and Dalton's indivisible atom theory.
What is the atomic number of an element with 11 protons?
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11
Atomic number equals the number of protons in the nucleus. An element with 11 protons has atomic number 11 (which is sodium).
Which of the following are isotopes of hydrogen?
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Protium, Deuterium, Tritium
Protium (¹₁H), Deuterium (²₁H), and Tritium (³₁H) are the three isotopes of hydrogen with mass numbers 1, 2, and 3 respectively. Helium is a different element.
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