Trend of the Periodic Table

What happens to atomic reactivity as atomic size increases?

• Reactivity increases because less energy is required to remove a valence electron.

• Reactivity decreases more energy is required to remove a valence electron.

• Reactivity remains the same because atomic radius has nothing to do with chemical reactivity.

• Reactivity becomes unpredictable

What is the relationship between atomic size and reactivity in the metal groups of the Periodic Table?

• Larger atoms have lower reactivity.

• Larger atoms have higher reactivity.

• Reactivity is independent of atomic size

• Reactivity fluctuates randomly with atomic size

What causes the decrease in atomic radius across a period in the periodic table?

• Energy shell or level increases

• Energy shell or level decreases

• Number of protons in nucleus and valence electrons in the outermost shell.

• The attractive force between the nucleus and outer energy shell decreases.

Why do larger atoms tend to be more reactive among metals?

• Their outermost electrons are further from the nucleus requiring less energy to remove a valence electron.

• They have higher electron affinities making it easier to remove a valence electrons.

• They have higher ionization energies

• Their nuclei attract electrons more strongly

For the nonmetal, which group is most reactive?

• Oxygen Family(6(

• Noble Gases(8)

• Halogens(7)

• Boron Family(3)

What metal group on the periodic table is the most reactive?

• Group 1

• Group 2

• Group 17

• Group 18

Answer explanation

The key term is "metal". Group 1 is the most reactive METAL group.

Identify the metal in period 3 that is more reactive than magnesium. 

• Na- Sodium
• Al- Aluminum
• Mg- Magnesium
• Cl- Chlorine

Which nonmetal group is the most reactive?

• Group 1
• Group 6

• Group 7

• Group 8

For the nonmetal, identify the element in the same period as sulfur and argon and is more reactive than sulfur(S) and argon(Ar).

• Si- Silicon
• Cl- Chlorine
• P - Phosphorus
• Ne- Neon

Elements in a .................. have similar chemical properties.

• period

• group

• row