AP EAPCET (Engineering) Atoms — practice questions
78 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice AP EAPCET (Engineering) Atoms in the app →According to the Bohr model, the ground-state energy of a hydrogen atom is:The modern periodic law states that the physical and chemical properties of elements are periodic functions ofElements of the modern periodic table are classified into how many blocks based on the differentiating electroAcross a period from left to right, the atomic radius generally:Which element has the highest first ionization energy in period 2?Which of the following arrangements is in correct order of increasing electronegativity (Pauling scale)?The element with electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^3$ belongs to which group Bohr's postulate quantises the angular momentum of an electron in a stationary orbit asWhich spectral series of hydrogen lies in the visible region of the electromagnetic spectrum?The minimum wavelength $\lambda_{\min}$ in the continuous X-ray spectrum of an X-ray tube depends only onThe ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series of hydrThe radius of the $n$th Bohr orbit in a hydrogen-like atom of nuclear charge $Z$ scales asThe de Broglie wavelength $\lambda$ of an electron in the $n$th Bohr orbit of hydrogen, in terms of the orbit According to VSEPR theory, the shape of a molecule is determined byThe hybridisation of carbon in methane (CH₄) isWhich molecule is non-polar despite having polar bonds?The bond order of the oxygen molecule O₂ (by molecular orbital theory) isA coordinate (dative) bond differs from a normal covalent bond in thatWhich species has sp hybridisation on the central atom?As bond order increases, bond lengthAn ionic bond forms byThe shape of NH₃ is pyramidal rather than planar becauseWhich has the highest dipole moment?Among the following, which is paramagnetic?Formal charge on an atom = Thomson's model of the atom was popularly given which name?At Rutherford's suggestion, who performed the alpha-particle scattering experiments in 1911?The thin metal foil used in the Geiger-Marsden scattering experiment was made of which metal?In the Geiger-Marsden apparatus, scattered alpha particles produced flashes on a screen coated with what?Roughly what fraction of incident alpha particles were deflected by more than 90 degrees?Why do most alpha particles pass straight through a thin gold foil?Rutherford's experiments suggested a nuclear size in which range?In alpha scattering, what is the impact parameter?How is an alpha particle with a large impact parameter deflected?If an alpha particle's kinetic energy is doubled, its distance of closest approach to a nucleus becomes what?What is the distance of closest approach of a 7.7 MeV alpha particle to a gold nucleus?Why is the gold nucleus treated as stationary during alpha scattering?Why do atomic electrons hardly affect alpha particles passing through a foil?A hydrogen electron's total energy is negative. What does this mean?For an electron in a circular orbit of hydrogen, the ratio of potential energy to kinetic energy is what?What is the radius of the electron orbit in a ground-state hydrogen atom?Approximately how fast does the electron move in the ground state of hydrogen?Classically, what initial frequency of light would a ground-state hydrogen electron emit?Classically, what should happen to an electron orbiting a nucleus?Classical theory applied to Rutherford's atom predicts which kind of emitted spectrum?How does the emission line spectrum of a low-pressure gas look?White light passing through a gas shows dark lines at the gas's emission wavelengths. This is called what?Bohr's first postulate lets an electron revolve in certain orbits how?According to Bohr's second postulate, which quantity of the orbiting electron is quantised?By Bohr's third postulate, an emitted photon's energy equals what?How does the radius of the third Bohr orbit of hydrogen compare with the first?What is the energy of a hydrogen electron in the n = 2 level?How much energy excites a ground-state hydrogen atom to its first excited state?Raising a ground-state hydrogen atom to the n = 3 level needs how much energy?In the hydrogen energy level scheme, what energy corresponds to n equal to infinity?How do the gaps between hydrogen levels change as n rises?At room temperature, in which state are most hydrogen atoms found?What energy photon is emitted when a hydrogen electron falls from n = 3 to n = 2?How much energy frees an electron from a hydrogen atom already in the n = 2 state?In which year was Niels Bohr awarded the Nobel Prize in Physics?Who explained Bohr's angular momentum quantisation using the wave nature of electrons in 1923?In de Broglie's explanation, how many electron wavelengths fit around the n = 4 Bohr orbit?In which year did Davisson and Germer experimentally confirm the wave nature of electrons?Bohr's model fails even for which simple atom?In quantum mechanics, the energy of the hydrogen atom depends on which quantum number alone?When does Bohr's orbital frequency equal the emitted line frequency?Who obtained an empirical formula for a group of hydrogen line wavelengths in 1885?Hydrogen spectral lines ending on the n = 1 level form which series?In which region of the spectrum do all Lyman series lines lie?In which year did J.J. Thomson put forward the first model of the atom?By what popular name is Thomson's atom model known?Under which scientist did Ernest Rutherford work as a research student?Which two workers carried out the alpha scattering experiment in 1911?Which metal formed the thin foil in the Geiger-Marsden scattering experiment?A 7.7 MeV alpha particle heads straight at a gold nucleus. What is its closest approach?What is the actual radius of a gold nucleus?Compared with the sum of nuclear and alpha radii, closest approach is?Scaled to the atom's proportions, where would Earth orbit the sun?