What is the velocity of an electron in the third orbit of \( \text{He}^+ \)? (\( v_1 \) for H = \( 2.19 \times 10^6 \, \text{m s}^{-1} \))

For hydrogen-like atoms, \( v_n = \frac{Z v_1}{n} \). For \( \text{He}^+ \) (Z = 2), \( n = 3 \), \( v_3 = \frac{2 \times 2.19 \times 10^6}{3} = 1.46 \times 10^6 \, \text{m s}^{-1} \).

Which orbital is represented by the quantum numbers \( n = 3, l = 1 \)?

\( n = 3, l = 1 \) corresponds to the 3p orbital.

NEET Chemistry: Structure of Atom — Practice Set 13 (10 MCQs)

Chemistry — Structure of Atom

Set 13 of 20

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Which of the following species has the same number of electrons as \( \text{Na}^+ \) (atomic number 11)?

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NEET Chemistry: Structure of Atom — Practice Set 13

Q1. Which of the following species has the same number of electrons as \( \text{Na}^+ \) (atomic number 11)?

Q2. What is the velocity of an electron in the third orbit of \( \text{He}^+ \)? (\( v_1 \) for H = \( 2.19 \times 10^6 \, \text{m s}^{-1} \))

Q3. Which orbital is represented by the quantum numbers \( n = 3, l = 1 \)?

Q4. The number of spectral lines in the Brackett series when an electron falls from \( n = 7 \) to \( n = 4 \) in a hydrogen atom is:

Q5. How many orbitals in an atom can have the quantum numbers \( n = 5 \) and \( l = 3 \)?

Q6. Which of the following represents the electronic configuration of an element with atomic number 16?

Q7. The ionization energy of a hydrogen atom from its ground state is \( 2.18 \times 10^{-18} \, \text{J} \). What is the energy required to ionize \( \text{He}^+ \) from its ground state?

Q8. A photon of frequency \( 6.0 \times 10^{14} \, \text{Hz} \) strikes a metal surface with a work function of \( 2.5 \times 10^{-19} \, \text{J} \). What is the kinetic energy of the ejected electron? (\( h = 6.626 \times 10^{-34} \, \text{J s} \))

Q9. The kinetic energy of an electron in the first orbit of \( \text{He}^+ \) is \( 4.36 \times 10^{-18} \, \text{J} \). What is its velocity? (\( m_e = 9.1 \times 10^{-31} \, \text{kg} \))

Q10. How many possible values of \( m_l \) are there for an electron with \( n = 3, l = 2 \)?