Atomic radius worksheet

What is the atomic radius of an element?

• The distance between the nucleus of an atom and its outermost electron

• The total number of protons in an atom

• The mass of an atom expressed in atomic mass units

• The number of neutrons in the nucleus of an atom

What trend in atomic radius occurs as you move from left to right across a period in the periodic table?

• The atomic radius increases because the nuclear charge decreases

• The atomic radius decreases because the nuclear charge increases

• The atomic radius remains constant because the number of energy levels remains the same

• The atomic radius increases because the number of neutrons increases

Which element has a larger atomic radius, Sodium (Na) or Magnesium (Mg)?

• Sodium (Na)

• Magnesium (Mg)

• Both have the same atomic radius

• Cannot be determined

Why does Fluorine (F) have a smaller atomic radius than Lithium (Li)?

• Because Fluorine has fewer protons than Lithium

• Because Fluorine has more energy levels than Lithium

• Because Fluorine has a higher nuclear charge, pulling electrons closer

• Because Lithium is a gas at room temperature

Which of the following elements has the smallest atomic radius?

• Helium (He)

• Neon (Ne)

• Argon (Ar)

• Xenon (Xe)

As you move across the periodic table from left to right, the atomic radius decreases.  This is because - 

• the number of protons increases, so attraction to electrons increases
• the number of energy levels increases
• the number of electrons increases
• the atomic mass increases

The atom with the largest atomic radius in Period 4 (row 4) is - 

• K
• Kr
• Fe
• Fe

As you move across the periodic table atoms tend to get smaller because, ______________.

• the atoms have more mass.
• the atoms have less mass
• the atoms have more protons.
• the atoms have less electrons.

Atomic radius decreases from left to right across a period because from left to right there is

• increasing number of valence electrons

• increasing inner shielding

• the nucleus pulls outer electrons in closer

• increasing number of protons in the nucleus

Which of the following will have a larger radius than Zinc?

• Gallium
• Aluminum
• Magnesium
• Strontium