CHAPTER 3: PERIODIC TABLE (1st hour)

Multiple Choice

Determine the period, group and block for the following electronic configuration,

1s² 2s² 2p⁶ 3s² 3p⁵

• Group 15, Period 3, s-block

• Group 7, Period 3, p-block

• Group 17, Period 3, p-block

• Group 5, Period 3, s-block

Multiple Choice

Determine the period, group and block for the following electronic configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵

• Group 5, Period 3, s-block

• Group 7, Period 4, d-block

• Group 17, Period 3, d-block

• Group 17, Period 4, d-block

Multiple Choice

Which of the following pairs is in the same group?

• ₉X and ₂₀Z

• ₇R and ₂₅Q

• ₇R and ₁₅Y

• ₅M and _2oZ

Multiple Choice

Which of the following is the electronic configuration of a Group 3 element?

• 1s² 2s² 2p⁶ 3s² 3p¹

• 1s² 2s² 2p⁶ 3s² 3p³

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹

Multiple Choice

Which of the following is the electronic configuration of an element X if element X is in period 3, group 13?

• 1s² 2s² 2p⁶ 3s² 3p¹

• 1s² 2s² 2p⁶ 3s² 3p³

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹

Multiple Choice

Which of the following elements has the largest atomic radius?

• Sulfur [Z=16]

• Chlorine[Z=17]

• Aluminum[Z=13]

• Sodium[Z=11]

Multiple Choice

Which of the following atoms has the smallest atomic radius?

• O

• B

• C

• F

Multiple Choice

Number of shell increases when going down a group of the periodic table. Increases of number of shell lead to

• electron shielding and a larger atomic radius

• electron shielding and a smaller atomic radius

• electron shielding and a higher ionization energy

• electron shielding and a higher electronegativity value

Multiple Choice

Based on the data given in below, arrange the elements in ascending order of atomic size

W: 1s² 2s² 2p³

X: 1s² 2s² 2p⁵

Y: 1s² 2s² 2p⁶ 3s¹

Z: 1s² 2s² 2p⁶ 3s² 3p²

• W < X < Z < Y

• X < W < Z < Y

• Y < Z < W < X

• Z < Y < W < X

Multiple Choice

The ions P⁺, Q²⁺ , R^3- and L^2- have same electron configuration as nobel gas, argon, ₁₈Ar. Which of the following statement is true about these ions. (The letters are not the actual symbol of the elements)

• They have the same of ionic size

• They are from the same period.

• The valence electrons in all ions experience the same effective nuclear charge.

• They have same number of valence electrons