Chemistry Lessons 2.1, 2.2, and 2.3 Retake Part 2

The ______ of the ______ charge in the nucleus

• neutron, neutral
• electron, negative
• Nuclear Charge, Positive

• proton, positive

Shielding Effect: The ____ electrons in an atom will ¨shield¨ the valence electrons from the ________.

• Core, Pull of the Nucleus.

• nucleus
• middle
• outer

What is an Atomic Radii?

• Distance between two atoms
• Number of protons in an atom
• Size of an atom
• Mass of an atom

Where are the biggest atoms on the Periodic Table?

• s-block or alkali and alkaline earth metals
• f-block or lanthanide and actinide series/Bottom Left

• d-block or transition metals
• p-block or main group elements

Where are the smallest atoms on the periodic table

• helium
• oxygen
• Bottom left

• Top Right

More protons in the nucleus = __________.

• Higher atomic mass
• Greater atomic radius
• More electrons in the nucleus
• stronger nuclear charge

More Protons -> _____

Attractive Force -> ¨Pulls¨ the electrons in more -> ______ size

• Stronger, Same

• Stronger, Larger

• Stronger, Smaller

• Stronger, Nonexistent

In Groups, Patterns of Atomic radii increases going ______.

• right
• left
• Top to Bottom

More Energy levels -> ______

distance -> ____

attraction -> doesn't ¨ pull ¨ in the electrons as much -> _____ radius

• Increased, less, bigger

• Decreased, More, smaller

Even though bottom elements have more protons, the increased nuclear charge is essentially ¨cancelled¨ by the core electrons providing a shielding effect.

• True

• False