Electronic Structures of Atoms Chemistry

Emission spectrum is a line spectrum consisting of discrete lines with certain frequencies. The lines in a spectrum become closer as frequency _______.

• increases
• decreases

An electron can only occupy a certain energy level. Thus, its energy is _______.

• quantised
• calculated
• discrete

The energy levels in an atom become closer when they are further away from the nucleus and finally converge in the _________.

• convergence limit
• ∞ (infinity)

When an electron absorbs energy, it is excited and moves up to higher energy levels. This is a/ an _____.

• unstable state
• ground state
• stable state

The electron will lose energy and falls back to lower energy levels. The energy is radiated as ______ with a fixed frequency, v.

• light
• electron
• discrete

Lyman series is formed when electrons fall from higher energy levels to _______.

• n = 1
• n = 2
• n = 3

Balmer series is formed when electrons fall from higher energy levels to____.

• n = 2
• n = 1
• n = 3

Pfund series is formed when electrons fall from higher energy levels to____.

• n = 5
• n = 4
• n = 3

Lyman : _______lines<br />Balmer : _______lines<br />Paschen : _______ lines

• ultraviolet emission, visible region, infrared region
• visible region, ultraviolet emission, infrared region
• infrared region, visible region, ultraviolet emission

s maksimum boleh masukkan electron ialah ___

• 2
• 6
• 10
• 14