Quizizz100: Atomic Structure #1

How many electronic transitions are possible between the first five energy levels of a hydrogen atom?

• 5

• 8

• 10

• 12

Which of the following is a statement of Planck's quantum theory?

• An orbital can accommodate a maximum of two electrons of opposite spins only.

• Electronic transition is accompanied by the emission of electromagnetic radiations.

• Electrons can be excited to higher energy levels by absorbing extra energy.

• Radiant energy can be absorbed or emitted in fixed amounts only.

Consider the first six energy levels of a hydrogen atom. How many electronic transitions corresponding to the Lyman Series and Balmer series are possible?

• Lyman series = 5; Balmer series = 4

• Lyman series = 4; Balmer series = 5

• Lyman series = 3; Balmer series = 4

• Lyman series = 6; Balmer series = 6

The proton number of an element X is 28. The Y²⁺ ion is isoelectronic with X. Which of the following combination is correct?

• Y²⁺ = 1s²2s²2p⁶3s²3p⁶3d¹⁰

• X = 1s²2s²2p⁶3s²3p⁶3d¹⁰

• Y = 1s²2s²2p⁶3s²3p⁶3d¹⁰

• X²⁺ = 1s²2s²2p⁶3s²3p⁶3d¹⁰

How many degenerate orbitals does a d-sub shell contain?

• 1

• 3

• 5

• 7

Which of the following statements is true regarding the line spectrum of hydrogen?

• The first line in each series has the longest wavelength.

• The ionisation energy of hydrogen can be calculated using the line with the lowest frequency in the ultra-violet region.

• The lines are all equally spaced.

• The lines converge when the wavelength increases.

What kind of orbital must an electron with the principal quantum number n = 3 occupy?

• An s-orbital

• A p-orbital

• A d-orbital

• Either an s, a p orbital or a d orbital

Which of the following statements explains why emission spectrum of hydrogen is a line spectrum?

• The hydrogen has only one electron.

• The lone electron in the hydrogen atom can revolve around the nucleus in fixed orbits only.

• The energy levels in the hydrogen atom are quantised.

• Electrons have dual nature.

In a hydrogen atom, an electron which orbital that has can absorb energy but cannot emit energy?

• 1s

• 2p

• 3s

• 3d

Which of the following species has 1 proton and 2 electrons only?

• ¹H

• ¹H^-

• ²H^-

• ²H⁺