Grade 9 Chemistry Revision Quiz

1) A ______________ represents the number of electrons in each subshell.

• electron configuration
• subshell notation
• valence electrons
• atomic number

2) _______________ electrons are electrons in the outermost energy shell.

• Core
• Inner
• Subshell
• Valence

3) Energy plays an important role in determining how electrons are arranged, or configured, in an atom. Electrons occupy the _________ energy subshells first.

• random
• lowest
• intermediate
• highest

4) The way in which electrons are arranged in various orbitals around the nuclei of atoms is called _____________

• atomic structure
• electron configuration
• molecular arrangement
• nuclear configuration

5) The _______________________between the negatively charged electrons help explain why each type of orbital has a different shape and relative energy.

• repulsion
• attraction
• interaction
• neutralization

6) Each orbital can hold ________ electrons.

• 4
• 3
• 1
• 2

7) The s subshell has _____ orbital, the p subshell has ______orbitals.

• 1, 3
• 1, 2
• 2, 4
• 3, 5

8) The individual atomic orbitals in an atom overlap in _________ dimensional space.

• four
• two
• three
• one

9) All s orbitals has _________ shape.

• spherical
• hexagonal
• triangular
• cylindrical

10) The maximum number of electrons in an energy level can be found by the following formula _____

• n²
• 2n
• 2n²
• n³