What are the primary building blocks of an atom?, Molecules and compounds, Protons, neutrons and electrons, Electrons and quarks, Only protons and neutrons, Who proposed the idea of indivisible particles called “atomos”?, John Dalton, Joseph John Thomson, Democritus, Ernest Rutherford, What is the weakness of John Dalton’s model?, It did not explain how electrons are arranged in the atom., It assumed atoms could change size and shape during reactions., It did not account for the presence of a dense nucleus in the atom., It proposed that atoms are made of smaller particles like protons and neutrons., Which scientist introduced the “plum pudding” model of the atom?, Niels Bohr, John Dalton, J.J. Thomson, James Chadwick, What did Ernest Rutherford’s gold foil experiment demonstrate about the atom?, Atoms are indivisible., Electrons are negatively charged., Atoms have a dense, positively charged nucleus., Gases exist as molecules., Which scientist’s model proposed that electrons orbit the nucleus in specific energy levels?, Niels Bohr, John Dalton, J.J. Thomson, James Chadwick, Which of the following best explains how Bohr’s model helped scientist better understand atomic structure compared to earlier models?, It described atoms as solid spheres., It showed that electrons move randomly., It suggested that atoms have only protons and electrons., It proposed that electrons move in fixed orbits with specific energy levels., What significant particle did James Chadwick discover in 1932?, Electron, Proton, Neutron, Photon, What was the main idea behind Schrodinger’s wave equation?, Electrons have no mass., Electrons are fixed in one location., Electrons behave like solid particles., Electrons behave like waves, providing a better understanding of their movement., Why was the discovery of the neutron crucial for atomic theory?, It explained how atoms are held together by electrical forces., It introduced the idea that electrons travel in fixed orbits around the nucleus., It showed that atoms contain negatively charged electrons outside the nucleus., It helped scientists explain why the nucleus has more mass than just the protons., What are the three basic subatomic particles of an atom?, Protons, Neutrons, and Photons, Protons, Neutrons, and Electrons, Atoms, Molecules, and Electrons, Protons, Electrons, and Nucleus, What charge does an electron carry?, +1, -1, 0, +0.5, Who discovered the proton?, J.J. Thomson, James Chadwick, Ernest Rutherford, Niels Bohr, What is the primary function of neutrons in the nucleus?, To determine the atomic number., To stabilize the nucleus., To determine chemical reactivity., To carry a positive charge., How is the atomic mass of an atom determined?, By the number of electrons., By the number of protons and neutrons., By the change of the nucleus., By the number of valence electrons., According to the Bohr model, what represents the arrangement of electrons?, Neutrons, Electron cloud, Nucleus, Electron shells, What is the maximum number of electrons that can occupy the L shell?, 2, 8, 18, 32, Why does the nucleus have the greatest effect on an atom’s mass?, Because it contains only electrons., Because it is the smallest part of an atom., Because it controls the movement of electrons around the shells., Because it contains protons and neutrons, which are heavier than electrons., A scientist wants to change the identity of an atom into a different element. Which subatomic particle should she change?, Electron, Neutron, Proton, Shell, Why are electrons arranged in different energy levels around the nucleus instead of staying close to it?, Because the nucleus repels all particles., Because electrons are too large to stay in the nucleus., Because protons push the electrons away at random distances., Because each shell an only hold a limited number of electrons.

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