Periodic Trends

Name Noble gas in period 4.

• Helium

• Neon

• Argon

• Krypton

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As you move down a group, atomic radius increases because - 

• you add more and more neutrons

• you add more and more protons

• you add more and more shells (energy levels)

• you add more atomic mass

Francium (Fr) has the lowest ionization energy in Group 1 because - 

• it has the smallest number of valence electrons

• it has the greatest atomic mass

• it has the greatest number of protons, so it attracts its electrons the strongest

• its 1 valence electron is very far from the nucleus, so little energy is needed to remove it

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Which of the following halogens has the greatest electronegativity?

• Chlorine (Cl)

• Bromine (Br)

• Iodine (I)

• Astatine (At)

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Which group of elements has the lowest ionization energies?

• Alkali Metals (Group 1)

• Alkaline Earth Metals (Group 2)

• Halogens (Group 17)

• Noble Gases (Group 18)

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What is a measure of the tendency of an atom to attract a bonding pair of electrons when the atom is in a compound?

• ionization energy

• electropositivity

• electronegativity

• electron energy

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Which atom has the largest atomic radius?

• potassium

• rubidium 

• francium

• cesium

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Which of these elements in group 1A has the largest atomic radius?

• cesium

• rubidium

• potassium

• sodium

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Which element in period 4 has the highest electronegativity?

• potassium

• calcium

• copper

• bromine

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Which group 4A element has the highest ionization energy?

• carbon

• tin

• silicon

• lead

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