Atomic structure and the periodic table

How many electrons does a chloride ion (Cl-) have? (Atomic number of chlorine is 17.)

• 1 16
• 2 17
• 3 18
• 4 19

Which element has the highest electronegativity?

• 1 Oxygen
• 2 Chlorine
• 3 Nitrogen
• 4 Fluorine

The electronic configuration 1s2 2s2 2p6 3s2 belongs to:

• 1 Sodium
• 2 Magnesium
• 3 Neon
• 4 Aluminium

Which quantum number describes the shape of an orbital?

• 1 Principal quantum number (n)
• 2 Azimuthal quantum number (l)
• 3 Magnetic quantum number (m)
• 4 Spin quantum number (s)

Across a period from left to right, the atomic radius generally:

• 1 Increases
• 2 Decreases
• 3 Stays the same
• 4 First decreases, then doubles

How many neutrons are in an atom of carbon-14? (Atomic number 6.)

• 1 6
• 2 14
• 3 8
• 4 7

The sodium ion (Na+) has the same electronic configuration as which noble gas?

• 1 Helium
• 2 Neon
• 3 Argon
• 4 Krypton

What is the maximum number of electrons that a 3d subshell can hold?

• 1 2
• 2 6
• 3 10
• 4 14