Periodic Trends

Why does radius decrease as you move across a period?

• because electrons are being added

• because protons are being added

• because energy levels are being lost

• because energy levels are being added

Which of the following has the largest electronegativity value?

• neon

• fluorine

• carbon

• lithium

The ability of an atom to attract another atom's electrons to itself is called

• electronegativity

• ionization energy

• periodic trend

• coulombic attractin

For which of these properties does lithium have a larger value than potassium?

• radius

• atomic mass

• ionization energy

• atomic number

Why does radius increase as you move down a period?

• protons are being added

• ionization energy is increasing

• protons are getting weaker

• energy levels are being added

As you move left to right across a period, ionization energy

• increases

• decreases

• says the same

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.

The atom with the largest atomic radius in Group 18 is - 

• Ar
• He
• Kr
• Rn

Atoms that have a high electronegativity, _______________.

• give up their electrons more easily.
• hold on to their electrons more tightly.
• have more electron shells.

The electronegativity of Cl is the highest in Period 2.  Why?

• Cl is the largest and has the greatest effective nuclear charge
• Cl is the smallest and has the lowest effective nuclear charge
• Cl is the largest and has the lowest effective nuclear charge
• Cl is the smallest and has the greatest effective nuclear charge