e- Configuration & Periodic Trends

The electron configuration of an element is 1s² 2s² 2p⁴. How many more electrons does the element need to satisfy the octet rule?

• 2
• 3
• 1
• 8

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From the following elements, which has the smallest atomic radius?

• Ca
• K
• Zn
• Cl

The element that has the greatest electronegativity is

• Oxygen
• Chlorine
• Sodium
• Flourine

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Which of the following could have the electron configuration 1s²2s²2p⁶3s²3p⁶
1.Cl^-
2. K⁺
3. Al³⁺

• 1 only
• 2 only
• 1 and 2
• 1, 2, and 3

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Which of these sequences do not show the correct trend in ionization energy?

• Al<Si< P<Cl
• Be<Mg<Ca<Sr
• I<Br<Cl<F
• Na<Mg<Al<Si

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From the following elements, which has the highest electronegativity?

• Na
• Mg
• Si
• Cl

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What is the electron configuration for Arsenic?

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4p³
• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p³
• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4d¹⁰ 4p³

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The atomic radius of sodium is 190 pm. The atomic radius of rubidium is 265 pm. What is the atomic radius of potassium?

• Smaller than 190 pm
• not enough information
• Greater than 265 pm
• Between 190 and 265 pm

The octet rule states that chemical compounds tend to form so that each atom has an octet of electrons in

• its p orbitals
• its d orbitals 
• its highest occupied energy level
• the 1s orbital

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The electron notation for aluminum is-

• 1s² 2s² 2p⁶ 3s² 2d¹.
• 1s² 2s² 2p⁹.
• 1s² 2s² 2p⁶ 3s² 3p¹.
• 1s² 2s² 2p³ 3s² 3p³ 3d¹.

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