KULIAH WEEK 3: ATOMIC STRUCTURE

Which of the following is NOT TRUE regarding Bohr postulates?

• Electrons can only move around the nucleus of an atom in a circular orbit.

• Electrons absorb energy in discrete amounts as they move from one energy level to another.

• Specific amount of energy corresponds to a definite energy level for the electrons.

• Electron at excited state was unstable, its only can fall back to n=1 and released a photon.

Calculate the energy of hydrogen atom at n= 2. Given R_H= 2.18 x 10^-18.

• -8.72 x10^-18 J

• 5.45 x10^-19 J

• -5.45 x10^-19 J

• -1.09 x10^-18 J

Choose a line that represent the second line in Balmer series.

• A

• B

• C

• D

Which line represent the third line in Paschen series?

• n=4 to n=3

• n=6 to n=2

• n=6 to n=3

• n=5 to n=2

When an electron of hydrogen atom fall to n=1, it will formed a line spectrum in ________.

• Lyman series

• Balmer series

• Paschen series

• Pfund series

Draw a line spectrum that represent 2nd line in Balmer series.