Periodic Trends_2024

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

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

• Ar

• He

• Kr

• Rn

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

• the number of protons increases and more electrons are added in the same shell, therefore nucleus attracts electrons more strongly.

• the number of protons increases and more electrons are added in a different shell, therefore nucleus attracts electrons more strongly.

• the number of protons increases and more electrons are added in the same shell, therefore nucleus attracts electrons more poorly

• the number of protons increases and more electrons are added in a different shell, therefore nucleus attracts electrons more poorly.

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

• K

• Kr

• Fe

• Fe

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

• its valence electron is very close to the nucleus, so more energy is needed to remove it

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

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

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

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The energy required to remove electrons is called as __________

• Electronegativity

• Atomic Number

• Atomic Radius

• Ionization energy

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Families all have similar

• Names

• atomic numbers

• atomic masses

• chemical and physical properties

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Electronegativity is...

• the ability of an atom to attract/ accept electrons

• the ability of an atom to lose electrons

• the energy required to remove an electron from an atom

• how easy it is to make friends.

Which has the greater Electronegativity:

N or C?

• C

• N

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Electronegativity __________ from left to right within a period and __________ from top to bottom within a group.

• decreases, increases

• increases, increases

• increases, decreases

• stays the same, increases

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